JPH0423015Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printer, and particularly to the layout structure of a circuit board.

[Prior Art] In a conventional printer, a mechanical frame supporting a mechanical part and a circuit board are arranged in a plane.
The circuit board generally includes a power supply, a voltage drop circuit, a rectifier circuit, a power transistor for driving a solenoid, a motor, etc., and a hardware circuit that handles the hardware, as well as a CPU, ROM,
It is equipped with a control circuit that handles software including RAM and general ICs. In the case of a printer, data is received from the post computer via the interface connector, and based on the signal, the control circuit performs calculations and data processing, and the character data etc. are sent to the solenoid,
Drives motors, etc.

[Problems to be solved by the invention] Since the mechanical frame and the circuit board are arranged in a two-dimensional manner, the external size of the printer becomes large, and the print head drive motor, paper feed motor,
There were problems such as the wiring to various sensors became long and complicated, and the number of parts and work hours increased.

An object of the present invention is to provide a printer that can be miniaturized, simplify wiring, and reduce the number of parts and man-hours.

Another object of the present invention is to provide a printer with excellent depth switch operability.

[Means for Solving the Problems] The configuration of the present invention for solving the problems of the above-mentioned prior art will be explained with reference to FIGS. 1 and 2, which correspond to embodiments. Mechanical frame 6 that supports mechanical parts
A circuit board is placed below the. The circuit board is
It consists of a hard board 7 that handles hardware, and a control board 8 consisting of a cassette that handles software. via a connector 10.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. As shown in Figures 1 and 2,
Mechanical parts such as the platen 1, the print head 2, the guide rod 4 that guides the carriage 3 that holds the print head 2, and the paper feed motor 5 are mounted on a mechanical frame 6.
A circuit board consisting of a hard board 7 for hardware and a control board 8 for software is disposed below the mechanical frame 6. The hard board 7 includes a power supply, a voltage drop circuit, a rectifier circuit, and a solenoid.
The control board 8 includes a power transistor and the like for driving a motor and the like.
It has a CPU, ROM, RAM, and general IC.
A hard board 7 disposed on the lower left side of the mechanical frame 6 is fixed to the bottom surface of the frame body 9, and a male portion 10a of a connector 10 is fixed on the right side. The control board 8 arranged on the lower right side of the mechanical frame 6 is made of a cassette, and the female part 10b of the connector 10 is fixed on the left side. Portion 10b is coupled to male portion 10a. The control board 8 is provided with a depth switch 8a, and a window 6a is formed in a portion of the mechanical frame 6 corresponding to the depth switch 8a.

A U-shaped motor support plate 11 is fixed to the left side wall of the frame 9 and the mechanical frame 6, and a print head driving motor 1 is mounted on this motor support plate 11.
2 and a reduction gear train 13 are attached. Further, the frame body 9 is provided with a power switch 14 on the left side wall, and a front switch 15 such as a function key on the upper part of the front wall. Further, a paper end switch 16 is fixed to the mechanical frame 6 behind the platen 1.

The connectors 20, 21, 22, and 23 fixed on the hard board 7 are connected to the paper feed motor 5, print head drive motor 12, front switch 15,
Wiring 24 to the paper end switch 16,
25, 26, and 27 are connected.

The hard board 7 side of the flat cable 30 that electrically connects the print head 2 and the hard board 7 is bent vertically, as shown in FIG. is fixed. In the part of the mechanical frame 6 that corresponds to this cable fixer 31,
A window 6b is provided. Further, a connector 32 is fixed on the hard board 7 corresponding to the window 6b, and a cable guide 33 is fixed on the connector 32. A detection lever 34 is fixed to the bottom surface of the carriage 3, and the detection lever 34 is fixed when the print head 2 is located at the home position.
A window 6c is provided in a portion of the mechanical frame 6 corresponding to the window 6c. A home position sensor 3 is mounted on the hard board 7 corresponding to the window 6c.
5 is fixed.

In this way, since the circuit board consisting of the hard board 7 and the control board 8 is arranged below the mechanical frame 6, the external size of the printer is reduced. In addition, a hard board 7 is placed below the mechanical frame 6.
By arranging this, the flat cable 30 and home position sensor 35 can be directly connected to the hard board 7, and intermediate wiring can be omitted, leading to cost reduction. Further, wiring 24, 25, which connects the hard board 7 to the paper feed motor 5, the print head drive motor 12, and the paper end switch 16,
27 is shorter and simpler, resulting in less noise.
In addition, the circuit board is divided into a hard board 7 and a control board 8, and the control board 8 is made into a cassette that can be attached and removed from the right side, making it easy to change the interface with the host computer by replacing the cassette. At the same time, the cassette can be removed and the elements inside the cassette can be operated and replaced, making it easy to change character types,
Easy to change and maintain various printing modes.

[Effects of the invention] As is clear from the above description, according to the invention, the circuit board consists of a hard board that handles hardware and a control board that is made up of a cassette that handles software, and the hard board is connected to the frame body. The control board is fixed to the bottom surface, and the control board is detachably connected to the hard board from the side of the frame via a connector, making it easy to change the interface with the host computer, as well as change character types and various printing modes. Switching is easy, and maintenance of the circuit board is also easy.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an embodiment of the present invention;
2 is a sectional front view taken along the line A--A in FIG. 1, and FIG. 3 is an enlarged perspective view of the connecting portion. 6...Mechanical frame, 7...Hard board, 8...
...Control board, 9...Frame, 10...Connector.

Claims (1)

[Scope of utility model registration request] In printers where the circuit board is placed below the mechanical frame that supports the mechanical part, the circuit board is
Consists of a hard board that handles the hardware, including power supplies, voltage drop circuits, rectifier circuits, and power transistors for driving solenoids, motors, etc., and a cassette that handles the software, including the CPU, ROM, RAM, and general ICs. 1. A printer comprising a control board, wherein the hard board is fixed to a bottom surface of a frame, and the control board is detachably connected to the hard board from a side surface of the frame via a connector.