JPS59104982A - Ribbon-feeding and ribbon-shifting mechanism - Google Patents

Abstract

PURPOSE:To simplify a ribbon-changing ribbon traction mechanism and perform ribbon feeding and ribbon traction by a single motive power source, by providing a cam mechanism in the ribbon-changing ribbon traction mechanism. CONSTITUTION:One end of a connecting bracket 19 is caused to abut against an upper-side cam surface of a cam 25 fixed to a ribbon motor 24, and by sliding the bracket 19 through rotating the cam 25, a lifting bracket 14 is rotated around a pivot shaft 13 to move a ribbon cassette 28. A clutch arm 23 is pressed against a lower-side cam surface of the cam 25, is oscillated in accordance with the rotation of the cam 25, and the oscillation is converted into rotation of a ribbon-feeding shaft 22 through a clutch mechanism. The shaft 22 engages to the ribbon cassette, and feeds a ribbon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ribbon shift/ribbon feed mechanism for a printer device.

Type-type sequential printing devices accomplish printing by pressing a matrix of type onto a sheet of paper with an ink ribbon interposed therebetween. In the past, this printing device had a single drive source (such as an AC motor) that operated continuously, and required functions (such as paper (feed, printing part feed, type feed selection, type impact, ribbon feed, ribbon shift, etc.). However, due to the complexity of this type of structure, this type has great disadvantages in terms of reliability, cost, weight, etc.

For this reason, the methods that have been implemented in recent years are
□It has a single driving source.

An object of the invention is to provide a simple and inexpensive ribbon shift mechanism for a printer device.

In the present invention, by using a cam mechanism or the like, it is possible to simplify the connection with the ribbon retraction and ribbon feed mechanisms, reduce the number of drive sources from two to one, and limit the rotation angle of this drive source. This performs ribbon shifting and ribbon feeding operations.

Next, the present invention will be explained in detail with reference to the drawings.

First, referring to FIG. 1 (5), the conventional device will be explained. Ribbon feed shaft 1, guide stand 2,
The clutch base 3 and the clutch arm 4 constitute a clutch mechanism, which converts the swinging motion of the clutch arm 4 into the rotational motion of the ribbon feed shaft in one direction.

The ribbon feed rotary solenoid 5u, which is the drive source for ribbon feed, is fixed to the base IIK, and power is transmitted to the clutch arm 4 through the torque piece 6 fixed to the shaft of the solenoid 5. In other words, when the rotary solenoid 5 is driven, torque is generated. The piece 6 reciprocates between the stoppers 7, and the reciprocating movement is transmitted to the clutch arm 4 by the force ε between the clutch gear formed on the torque piece 6 and the gear formed on the clutch arm 4. A damper rubber 8 is formed at the end of the torque piece 6 to absorb the impact when it hits the stopper 7. This reciprocating movement of the clutch arm 4 causes the shaft 1 to rotate in one direction through the one-way clutch mechanism, and the feed shaft portion at the tip of the shaft 1 gets stuck in the ribbon feed roller 10 provided inside the ribbon cassette 9. Perform ribbon feed operation.

Next, the ribbon shift operation will be explained with reference to FIGS. 1(B) and 1(C). The ribbon cassette 9 is rotatably supported by a fulcrum A, further urged counterclockwise by a cassette spring 13, and pressed against the ribbon sheathon lenoid 12. Figure 1 (B) is
When the solenoid 12 is not energized, the filter and ribbon cassette 9 are approximately parallel to each other. Solenoid 12
When the cassette 9 is energized, the cassette 9 rotates slightly clockwise 9, as shown in FIG. 1 (q), and the ribbon position shifts.

Referring now to FIG. 2(5), in one embodiment of the present invention, the support bracket 11 is fixed to the base 12 and rotatably holds the lift bracket 14 via the pivot shaft 13. There is. The connect bracket 19 is slidably held by a guide bracket 17 fixed to the pace 12 by a guide pin 18.

A pin 16 driven into one end of the bracket 14 and slightly bent engages with an elongated hole at one end of the connect bracket 19 to form a link mechanism.

The other end of the fitting plate is brought into contact with the upper cam surface of the cam 25 fixed to the ribbon motor 24, and serves as the first driven joint of the cam. Like the conventional machine tower described above, the ribbon cassette 28 is supported by a fulcrum A, is biased counterclockwise in the figure by a cassette spring 30, and is pressed against one end of the lift bracket 14. ing. When the connect bracket 19 slides due to the rotation of the force l, 25, the lift bracket 14 rotates about the pivot shaft 13 and moves the ribbon cassette 28 by 8.

The clutch base 21, the kite stud 20, the clutch arm 23, and the ribbon feed shaft 22 constitute a clutch mechanism, and only the clockwise movement of the clutch arm 23 in the figure is transmitted to the ribbon feed shaft.

The clutch arm 23 is pressed against the lower cam surface of the cam 25 by a spring 27, and serves as a second driven joint to perform rocking motion in accordance with the rotation of the cam 25, and the clutch mechanism described above causes the ribbon to be moved. This is converted into rotation of the feed shaft 22. This ribbon feed shaft 22 engages the ribbon cassette and feeds the ribbon.

Next, the relationship between the rotation angle of the cam and the operation of the two driven joints will be explained with reference to FIG. In this example, cam 1
5 is the connection bracket 1 at a rotation angle of 0 to 30'.
Slide 9. That is, a ribbon shift operation is performed. The clutch arm 23 is swung at a reduced rotation angle of 45° to 90°. That is, a ribbon feeding operation is performed. That is, when the rotation angle is 0°, the cam 25 contacts the connect bracket 19 and pushes it to the position shown in FIG. 3(A). At this time, the lift bracket 14 is
), the left side of the cassette 28 is lifted up from the fulcrum. When the rotation angle reaches 30 degrees, the lift bracket 19 moves to the position shown in FIG. 3(B), and the lift bracket 14 and the cassette 28 are in the state shown in FIG. 2(B). It is clear from FIG. 2(B) and the above description that the force for moving the connect bracket is generated by the cassette spring 40. At the position of the rotation angle of 30°, further movement in three directions is restricted by the connect bracket 19Vi and the guide pin 18.

(It is set in the state shown in FIG. 2 (5).) Thereafter, the two driven joints (connect bracket 19 and clutch art 23) do not move until the rotation angle reaches 45 degrees.

When the rotation angle exceeds 45°, the error occurs as shown in Fig. 3. q'''C As can be seen, the clutch arm 23 begins to operate and performs ribbon feeding as described above.

As explained above, the present invention has the effect that by providing a cam mechanism in the ribbon change/ribbon retraction mechanism, the mechanism can be simplified and the ribbon feed mechanism and ribbon retraction mechanism can be driven by one power source. Garuru.

[Brief explanation of drawings]

FIG. 1 (5) is a perspective view of the conventional device, FIGS. 1 (B) and (q are partial side views thereof, and FIG. 2 (A) is a perspective view of the conventional device
A perspective view of lJ, Fig. 2<B) and (Q is a partial sectional view of Ij, Fig. 3 (!'X)-(-'))
This is a schematic diagram showing the rotation angle and the movement of the driven joint. Representative Patent Attorney Susumu Hara 1 Figure≠2 Figure Yu 3 t5 (A) (D) Ward

Claims (1)

[Claims] A type-type sequential printing device includes a motor, a cam connected to the motor, and two cam driven parts that operate in engagement with the cam, one of the two cam driven parts, The ink ribbon is fed through a clutch mechanism, etc., and the other is configured to change the relative position of the ink ribbon within the printing mechanism through a link mechanism, etc., and the above two operations are performed depending on the rotation angle of the motor. A ribbon feed/ribbon shift mechanism characterized by controlling each.