JPS5919029B2 - Typewriter ink ribbon lift device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ribbon lifting device for a typewriter in general office equipment.

Generally, when printing on office equipment that uses ribbons,
It is desired to vary the lift amount of the ribbon for the purpose of extending the ribbon replacement period by sequentially changing the height of the contact position of the type with the wide ribbon and effectively using the wide ribbon. Conventional devices of this type consist of a number of link parts, cams, cam drive motors, solenoids, etc., and have a structure in which the movement of the ribbon lifting/lowering driving cam is transmitted to the driven roller and then to the ribbon lift lever via the connecting link. Generally, a plurality of cams having different lift amounts are provided in order to obtain multiple lift amounts, and a driven roller that moves together with the cams is displaced in the cam axis direction. There are also devices that use a plurality of solenoids and are configured to obtain desired movement via links.

In these devices, the space occupied by the components is large, and the complexity of the structure of the power transmission mechanism makes it difficult to assemble the components and can easily cause failures. Further, the use of solenoids used for multi-stage switching has some form of mechanical contact, and has many problems in terms of wear resistance, that is, durability, and noise. In order to solve these drawbacks, the present invention utilizes a pulse motor as a swinging drive source for the ribbon lift lever, and by directly connecting the ribbon lift lever to the swinging member of the pulse motor, a desired step position can be selected. This makes it possible to easily change the ribbon lift amount with fewer components.Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall perspective view of an embodiment of the apparatus of the present invention in a typewriter, in which numeral 1 denotes a fixed part rail of a linear pulse motor, which is fixed between the left and right side frames (not shown) of the typewriter.

Reference numeral 2 denotes a carriage, which constitutes a movable part of the linear pulse motor and performs a spacing operation every printing operation.

3 and 4 are a movable part and a fixed part made of magnetic material, which constitute a pulse motor for ribbon lift which is a stepping drive device;
As shown in FIG. 2, the movable part 3 includes a fan-shaped part 3a and an arm part 3b.
The central portion of the arm portion is rotatably supported by the side frame of the carriage 2.

The fixed part 4 is fixed to the side wall of the carriage 2 so as to be located below the fan-shaped part 3a of the movable part 3. Further, as shown in FIG. 2, this pulse motor for ribbon lift has teeth formed on the lower surface of the fan-shaped part 3a, and four excitation motors A, B, Cl, and D on the fixed part 4 side opposite to the teeth. Each phase is appropriately excited according to a 2-2 phase excitation method based on a drive command from a control device (not shown).
The movable part 3 is caused to swing. 6 is a type selection motor placed on the carriage 2; 7 is a type wheel supported on the rotor shaft of the type selection motor; 8;
is a ribbon cartridge storing a wide carbon ribbon 9, and a portion of the carbon ribbon 9 is exposed to the outside.

10 is a ribbon lift lever, one end of which is connected to the movable part 3;
The carbon ribbon 9 is fixed to the free end of the arm portion 3b, and a guide portion 11 for guiding the carbon ribbon 9 is formed at the other end.

The guide portion 11 guides the carbon ribbon 9 so that the exposed portion exposed from the ribbon cartridge 8 is positioned in front of the type wheel 7 as shown in FIG. 1. Reference numeral 012 is a biasing spring. The ribbon lift lever 10 is urged to the home position, and the ribbon lift lever 10 is always
is biased and held in the original position where it engages with the stopper 13. Next, the operation of the present invention will be described in detail with reference to the side view of the ribbon lift mechanism shown in FIG. 2, the change in printing position relative to the carbon ribbon shown in FIG. 3, and the explanatory view of FIG. 4.

When a character key (not shown) is pressed, the type selection motor 6 operates, and in parallel with the operation of selecting the character corresponding to the print key, a ribbon feeding operation and a ribbon lift operation described later are performed independently. After the printing is done, press the hammer (
(not shown) is driven and the character corresponding to the pressed character key is printed on the paper.

Now, the ribbon lift operation will be explained for each printing operation with reference to Figures 2, 3, and 4. First, when the power is turned on, the C and D phases of the fixed part 4 are excited, and the movable part 3 is activated. It is positioned as shown in Figure 2.

At this time, the ribbon lift lever 10 is positioned and held at the original position, and the carbon ribbon 9 is positioned and held at the rest position. When a character key is pressed in this state, the drive device causes the fixed part 4 to
and A phase are excited, and the movable part 3 is moved to the ribbon lift lever 1.
0 is rotated counterclockwise in FIG. As a result, the carbon ribbon 9 is positioned such that the first position of the carbon ribbon 9 is located at the printing position. After that, the printing hammer mentioned above is driven, and the first printing hammer of the carbon ribbon 9 is driven.
The printing operation using the position is completed. When the next character key is pressed, the A and B phases of the fixed part 4 are excited by the drive circuit, and the ribbon lift lever 10 of the movable part 3 is rotated from the first movement position to the second movement position. As shown in FIG. 2, it is further rotated counterclockwise. As a result, the carbon ribbon 9 is positioned and held so that the second position of the carbon ribbon 9 is located at the printing position, and then the above-described printing operation is performed. Furthermore, when the next character key is pressed, the B and C phases of the fixed part 4 are excited, and the ribbon lift lever 10 is moved from the second movement position to the third movement position so that the position of the carbon ribbon 9 is at the printing position. It is moved to a moving position. When the next character key is pressed while the ribbon lift lever 10 is in the third movement position, the D and A phases of the fixed part 4 are excited, and the first position of the carbon ribbon 9 is at the printing position as described above. In order to do this, the ribbon lift lever 10 is moved from the third movement position to the first movement position.

As described above, subsequent operations on the character keys are controlled by the drive device so that the second and third positions of the carbon ribbon 9 are sequentially positioned at the printing position.
When the power is cut off, the excitation force from the fixed part 4 to the movable part 3 disappears, so the ribbon lift lever 10
According to the urging force of 2, it returns to the original position where it engages with the stopper 13. Since the above-mentioned embodiment has the above-described structure, its advantage is that the transmission of motion from the drive source is direct without going through an intermediate member, so it can be carried out very simply and easily, and it can be moved at any multiple stages. Easy to hold.

In the above explanation, the case of three-stage switching has been described as a plurality of stages, but it goes without saying that the amount of movement and multi-stage switching can also be made by changing the tooth pitch, number of pulses, etc. of the pulse motor.

Although this embodiment shows a configuration in which the stepping drive device is supported on the frame of the carriage, it is of course possible to use a configuration in which the stepping drive device is supported on the frame of the typewriter body. The ribbon lift lever for moving the ink ribbon exposed from the cartridge is directly fixed to the movable part of the step drive device at one end and supported by the frame, so it is a connecting part from the step drive device to the ribbon lift lever. is completely unnecessary, simplifying the structure, and therefore, the mass of the mechanism driven by the stepping drive device can be significantly reduced, making it possible to speed up the movement of the ink ribbon. In particular, the ribbon lift Since the lever moves only the ink ribbon exposed from the ribbon cartridge, its effect is significant.

In addition, since there are few overall components, it can be stored in a small space, and the structure is extremely simple so that it can be easily assembled and manufactured at low cost, which improves the reliability of each element and is significant from the viewpoint of maintenance costs. It is. Furthermore, the use of a solenoid, which is generally used as a drive source for multi-stage switching, has some form of mechanical contact, but the structure of the present invention has no contacts that would cause problems during switching, and is resistant to wear. The effect is tremendous from the viewpoint of durability and noise.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a typewriter embodying the present invention, Fig. 2 is an explanatory diagram showing details of the ribbon lift mechanism consisting of a ribbon lift pulse motor and a ribbon lift lever, and Fig. 3 is printing on carbon ribbon. 4 is an explanatory diagram showing the position, and FIG.
3 is the printing carriage, 3 is the ribbon lift motor movable part, and 4 is the printing carriage.
1 is a fixed part of a ribbon lift pulse motor which will be described later, 10 is a ribbon lift lever, and 9 is a carbon ribbon.

Claims (1)

[Scope of Claims] 1. In connection with the printing operation, by operating the ink ribbon lift device and moving the ribbon lift lever at the original position to a plurality of operating positions as appropriate, the ribbon is exposed from the ribbon cartridge and removed. In a typewriter configured to use only the ink ribbon guided by a lift lever in multiple stages, the ink ribbon lift device includes a movable part that is swingably supported by a frame and a movable part that is close to the movable part. It has a fixed part fixed to the frame, and by generating magnetic force between the movable part and the fixed part, the movable part can be moved stepwise relative to the fixed part and positioned at multiple positions. a stepwise drive; a controller for providing stepwise drive commands to the stepwise drive to position the ribbon lift lever in one of the actuated positions in connection with the printing operation; The ribbon lift lever is
An ink ribbon lift device for a typewriter, wherein one end of the ink ribbon lift device is directly fixed to a movable part of the stepping drive device and supported by a frame. 2. The typewriter ink according to claim 1, wherein the facing surfaces of the movable part and the fixed part are constituted by an arcuate curved surface centered on the center of the rocking motion. Ribbon lift device.