JPS62222872A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To detect not only the opening and closing state of a cover but also the origin point of a carriage, by arranging a detection means between a detectable position and a non-detactable position and moving a body to be detected from the non- detectable position to the detectable position when the origin point of the carriage is detected. CONSTITUTION:When a carriage is positioned at a printing area and a power source switch is closed in such a state that a cover is opened, CPU33 is set to an initial state and a cover opening state detecting arm 32 is separated from an operation lever 30 and a detection switch 27 is closed by a tensile spring 31 to input an ON-signal to CPU. CPU does not excite an electromagnet 23 at the ON-time of a power source and does not set a holder 10 to a ribbon lift state and, therefore, the ON-signal of the switch 27 is discriminated as the detection signal of a cover opening state. When the cover is closed and the switch 27 is turned OFF by the arm 32, CPU excites the electromagnet 23 and the carriage is returned to the origin point by a drive mechanism 24 in such a state that the holder 10 is moved upwardly to a printing position to be held at said position and a piece 28 to be moved is pressed by an origin detecting arm 25 to turn the switch 27 ON and the carriage is moved to the home position in a printing area.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronic typewriter in which the open/closed state of a cover and the origin of a carriage are detected by a common detection means.

(Prior Art) In a conventional electronic typewriter, a carriage origin detection switch and a cover open switch for detecting the open/closed state of the cover of the printing device are separately arranged on both sides of the frame of the printing device. That is, when the cover is open, the cover open switch is turned on to detect the cover open state, and when Kittredge is located at the home position, the home detection switch is turned on and the home position is detected. It has become.

(Problems to be Solved by the Invention) As mentioned above, conventional electronic typewriters have dedicated switches for detecting the open/closed state of the cover and for detecting the origin position of the carriage, which increases the number of parts and increases the number of parts. , which caused an increase in costs.

Therefore, it is conceivable to use a common detection switch for both the switches, but in that case, the following problems arise.

When the power switch of the electronic typewriter is turned on and the cover is in the A-bun state, the detection switch will be in the on state, but this on state may be due to the on operation to open the cover or because the carriage is located at the origin. I couldn't tell if it was turned on or not.

If the carriage is moved down to the home position, if the cover is closed after this, the 4-carriage will be located at the home position, so the detection switch will remain in the on state and a sudden restart will not be possible. The problem is that it disappears.

In this case, you will need to turn the power switch on and off in order to reboot, and if you do this, the data stored on the media that has not been backed up will be erased. There is a problem with it.

(Object of the Invention) This invention was made to solve the above-mentioned problems, and includes detecting the open/closed state of the cover using a common detection means,
An object of the present invention is to provide an electronic typewriter capable of detecting the origin of a carriage.

(1st Step for Solving the Problem) The present invention provides a detection object that is movably arranged between a detection position where a detection means can detect and a non-detection position where the detection means cannot detect, and a Killeridge. The present invention is characterized by comprising a detected object moving means for moving the detected object from a non-detection position to a detection position when detecting the origin.

(Function) With the above configuration, when the detected object is moved from the non-detection position to the detection position by the detected object moving means, the detection means detects the origin of the carriage.

Further, when the cover is open, the detection object moving means is not driven and the detection object is held at a non-detection position, and in this state, the detection means detects the cover open state.

(Embodiment) An embodiment in which the present invention is embodied in an electronic typewriter will be described below with reference to FIGS. 1 to 8.

In FIG. 2, an electronic typewriter 1 has a keyboard 2 provided with a large number of character keys 3 and various function keys. Further, a printing device 4 is provided on the rear side of the keyboard 2, and a platen 6 is rotatably supported on a frame 5 of the printing device 4.

The carriage 7 is movably supported on a guide shaft 8 installed between both sides of the frame 5 in parallel with the platen 6, and is movable back and forth along the printing direction by a carriage drive mechanism 24 shown in FIG. It has become. As shown in FIG. 4, a support shaft 9 is inserted and fixed in the upper front part of the carriage 7, and a holder 10 is swingably supported on the support shaft 9 at approximately the center. A ribbon cassette 12 having a printing ribbon 11 is removably attached to the upper surface of the printer. The printing ribbon 11 is arranged facing the platen 6 with a part of it exposed from the ribbon cassette 12.

Furthermore, support pieces 13 are protruded from both sides of the holder 10.
Near the base end of the support piece 13 is a winding spool (not shown) for winding up the correction ribbon 14 and a correction ribbon 1
A supply spool 15 for supplying the correction ribbon 14 is rotatably supported, and a guide roller 16 for guiding the correction ribbon 14 is provided on the upper surface of the tip end of the support piece 13. Therefore, below the printing ribbon 11, the correction ribbon 14 is attached to the platen 6.
It is designed to be placed opposite to.

A swing shaft 16 is inserted into and supported by the carriage 7 below the support shaft 9, and a first lever 17 whose side surface is shaped like a square is swingably supported at the center of the swing shaft 16. , is always held at the position shown in Fig. 4.A second lever 18 is supported at the other end of the first lever 17 so as to be swingable between the rest position shown in Fig. 4 and the operating position. An engagement pin 19 is protruded from one end of the second lever 18. A long hole 21 extending in the longitudinal direction of the side wall of the holder 10 is formed in the side wall of the holder 10 near the other end of the second lever 18. Bin 19
is engaged. Further, the elongated hole 21 is fully cammed with respect to the engagement pin 19 that swings around the swing shaft 16, and serves as a connecting means for connecting the second lever 18 and the holder 6-10. .

Further, an electromagnet 23 is fixed to the carriage 7 so as to face the end of the first lever 17, and is constituted by a coil wound around a core 22 and serves as a detection object moving means. The electromagnet 23 is bent so that it is energized when the character key 3 is pushed up and when the carriage 7 returns to its origin. Then, when the electromagnet 23 is excited, the first lever 1
As the upper end of 7 is attracted and the second lever 17 is rotated counterclockwise, the second lever 18 is moved downward and the holder 1 is rotated counterclockwise around the support shaft 9.
0 rotates to position the ribbon cassette 12 at the printing position shown by the chain line in FIG. A predetermined character is printed on the printing paper P on the platen 6 by the cooperation of the printing ribbon 11 and the petal-shaped type wheel 2/I activated by the depressing operation of the character key 3.

On the outer surface of the support piece 13 provided on the left side of the carriage 7, there is an arm 2 for detecting the origin of the carriage as an object to be detected.
5 is provided protrudingly. Further, the tip end 25a of the gear ridge origin detection arm 25 is curved downward in an arc shape, and when the arm 25 moves upward from the position below the redistribution driven piece 28, that is, the non-detection position, and moves to the detection position, The lower part of the cut piece 28 is driven to the ON operation side.

Further, a switch mounting piece 26 is provided protruding from the outer surface of the left side of the frame 5, and a detection switch 27 as a detection means is fixed on the switch mounting piece 26. Detection switch 27
The fixed contact 27a and the right elastic movable contact 27b are extended rearward and are always in the OFF state.
'J has been. The base end 28a of the driven piece 28 is fixed to the 1-unit moving contact 27b, and the tip of the driven piece 28 is in the state 'c' when the holder 10 is located at the printing position, and the +-t-ridge 7 returns to its origin. When activated, the tip 25a of the detection arm 25 is moved so that it can be pressed at the tip 25a of the detection arm 25.

Further, a support piece 29 is protruded from the left side outer surface of the frame 5 behind the mounting position of the detection switch 27, and an operating rod 30 is pivotably supported on the base end side of the support piece 29. I'm at my desk. The distal end portion 3Qa of the operating rod 30 extends forward, is bent in a [-shape], and is arranged so as to be able to come into contact with the center portion of the driven piece 28. Further, the other end of a tension spring 31, one end of which is fixed to the frame 5, is attached to the base end 30b of the operating rod 30 that extends rearward from the pivot point, and the other end of the tension spring 31 is attached to the base end 30b of the operating rod 30, which extends rearward from the pivot point. The piece 28 is biased in the pressing direction. Also, the printing device 4
is provided with a cover (not shown) that can be opened and closed to cover the upper part thereof, and a cover open detection arm 32 that protrudes downward from the cover is connected to the base end 30b of the operating rod 30 and the frame when the cover is closed. The proximal end portion 30 of the actuating rod 30 resists the biasing force of the tension spring 31.
b, and the tip 30a of the operating rod 30 contacts the movable contact 27.
b is not pressed.

Next, to explain the electric circuit of this electronic typewriter 1, a central processing control circuit (hereinafter referred to as CPU) 33 includes a program memory 34, operates according to a control program stored in the program memory 34, and operates the keyboard 2.
The electromagnet 2 is activated based on key operations such as letters 4--3 above.
3 and 17 printers, such as M424, are used to perform printing operations. During the normal printing operation, the CPU 33 moves the carriage 7 to the carriage drive 1fHJ with a predetermined distance between the print head [(movement range of the carriage 7 that moves during the printing operation) and the origin position. Structure 24
1. The carriage origin detection arm 25 turns on the detection switch 27. ! There is no such thing.

Further, a detection switch 27 is connected to CP (J33), and when the detection switch 27 is turned on, the ON signal thereof is inputted.

Next, the operation of the electronic typewriter 1 configured as described above in the print mode will be explained.

Now, when the carriage 7 is located in the printing area and the cover is in the open state, when the power switch is turned on, step 1 (hereinafter step will be referred to as S), the CPU 33 is set to the initial state, 1t.

As shown in FIG. is activated. Therefore, C
The PU 33 inputs the ON signal of the detection switch 27.

When the power is turned on, the CPU 33 does not excite the electromagnet 23 and therefore does not hold the holder 10 in the ribbon riff 1- state, so the on signal from the detection switch 27 is determined to be the on signal that detects the cover open state. (S2) and waits until the cover is closed and the detection switch 27 is turned off.

When the cover is closed and the cover open detection arm 32 operates the base end 30b of the operating rod 30 to the off side against the biasing force of the tension spring 31, the detection switch 27 is turned off (see Fig. 1). , move on to the next step 83. In S3, the CPU 33 drives and holds the electromagnet 23 in an excited state, thereby holding the holder 10 upwardly at the printing position.

Then, when the holder 10 moves up to the printing position, the CP
U33 determines whether or not the detection switch 27 has been turned on (84>), and if the CPU 33 determines that the detection switch 27 has not been turned on, the process moves to S5. S5
At J3, the CPU 33 drives the carriage drive mechanism 24 while holding the holder 10 at the printing position, and returns the kittlege 7 to its origin.

When the carriage 7 returns to the origin, the carriage origin detection arm 25 presses the driven piece 28 in S6, thereby turning on the detection switch 127.

Then, in S7, the CPU 33 drives the spear drive mechanism 271 by -1 based on the ON signal of the detection switch 27, and moves the carriage 7 from the origin position to the right by a predetermined amount to position it at the home position within the print area. Ru.

Also, when the carriage 7 is located at the origin position from the beginning in Sl, -83 is passed to Sl, but in S4, the origin detection arm 25 located on the F side of the driven piece 28
moves upward with the ribbon riffle movement and moves the driven piece 28 to A.
In order to operate the printer, the detection switch 27 is turned on.1 In this state, the CPU 33 determines that the 4-carriage 7 is located at the origin position, moves to S7, and moves the carriage 7 to the printing area.

In this way, when the power switch is turned on and the detection switch 27 performs a detection operation, the carriage origin detection arm 25 is located at the non-detection position, so the detection switch 27 does not detect the origin. , it can be determined that the cover open state has been detected, and therefore, unlike the conventional case, it is possible to determine which state the detection switch 27 has detected.

Furthermore, if the carriage 7 is moved to the home position while the power switch is on and the cover is open, the carriage home position detection arm 25 is in the non-detection position, so the detection switch is not activated. 27 is in an off state, and the typewriter 1 will not operate in this state. After that, when the cover is closed, the detection switch 7 is turned off, and S2 to S3, 84 . In order to migrate to S7,
There is no need to restart the device, so data stored in memory that has not been backed up will not be erased, unlike in the past.

Note that this invention is not limited to the above embodiments,
For example, it may be specified as follows.

(a) In the above embodiment, the carriage origin detection arm 25 was moved upward by the ribbon lift operation, but instead, the carriage origin detection arm 25 is held in the upward movement position when the correction ribbon 14 is operated by the correction lift operation. Alternatively, the detection switch 27 may be turned on.

(b) To move the carriage origin detection arm 25 from the non-detection position to the detection position, use a detection object moving means such as a special solenoid that moves it upward during the origin return operation and holds it at the detection position.

(c) Use an optical lens →) or a magnetic L sensor as the detection means.

(d) In the above embodiment, the Kittredge origin detection arm 25
The direction of movement from the non-detection position to the detection position was up and down, but instead it could be moved in the front-back direction, the left E-J direction, or the 3-way direction.
It may be the direction of dimensional house movement.

(Effects of the Invention) As detailed above, the present invention can solve the conventional problems and can also be used as a detection means, thereby reducing the number of parts and reducing costs. It has excellent effects that can be achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of an embodiment embodying this invention;
Fig. 2 is a perspective view of the electronic typewriter, Fig. 3 is an exploded perspective view of the holder and ribbon cassette, Fig. 4 is a side view of the gear ridge, Fig. 5 is a plan view of main parts for explaining the operation, and Fig. 6 is a perspective view of the electronic typewriter. Figure 7 is a plan view of the main parts for explaining the operation, Figure 7 is an electric block circuit diagram, and Figure 8 is a diagram. 1 is an electronic typewriter, 2 is a keyboard, 7 is a gear ridge, 12 25 is the carriage origin detection arm, 27 is the detection switch, and 32 is the cover open detection arm. Patent applicant Brother Industries, Ltd. Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] A printing device including a carriage that is relatively movable along printing lines, a cover that covers the printing device in an openable/closable manner, and detects the open/closed state of the cover and detects the origin of the carriage. In an electronic typewriter, the electronic typewriter is equipped with a common detection means, the detection object being movable between a detection position where the detection means can detect it and a non-detection position where it cannot be detected, and an origin detection point of the carriage. An electronic typewriter characterized in that the electronic typewriter further comprises a detection object moving means for moving the detection object from a non-detection position to a detection position.