JPS59194884A - Multicolor ribbon change-over device for printer - Google Patents

Abstract

PURPOSE:To reduce inertial load, prevent a multicolor ribbon from bounding and capable of changing over the color of the ribbon smoothly and speedily, by incorporating a stepping motor into an operating member. CONSTITUTION:When the stepping motor 8 is driven to rotate forward and backward, a gear 7 is rotated through a pinion 9, and a main body 5 of a grooved cam is rotated. A pin 3 of a change-over arm 1 engaged with a groove 6 provided in the main body 5 is moved along the groove 6, and the arm 1 is turned with a pin 4 as an axis to move the multicolor ribbon 11, whereby a predetermined color is made to correspond to a printing head 10, namely, the color is changed over. When selecting an arbitrary color by the stepping motor 8, the motor 8 is stopped at a home position of color in a mechanical manner by overrunning to the final end of the groove 6 of the main body 5 of the grooved cam, pulses are further fed at that position to maintain a disordered condition until a prescribed phase of the motor 8 is reached, and supply of the pulses is stopped at the prescribed phase.

Description

[Detailed description of the invention] The present invention relates to a multicolor ribbon switching device for a printer.

The multicolor ribbon switching device used in conventional printers such as typewriters changes the position of the ribbon divided into multiple colors via a switching arm by turning on and off a solenoid.
Color changes were performed by changing the required colors of a multicolored ribbon to the print head. For this reason, it is difficult to control the acceleration motion of the solenoid, and problems such as inertial load on the switching arm and bounce caused by the stopper have arisen.

In order to perform more stable switching with the method using a solenoid, a more powerful solenoid is required, which results in an increase in the power supply for driving the solenoid and an increase in ff1ffi of the head carrier. 9. It will also affect the overall configuration of the device, such as power up.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, suppress the inertia load of the multicolor ribbon switching member and bounce due to the collar, etc.
To provide a multicolor ribbon switching device which can stably and smoothly switch multicolor ribbons, has a simple mechanism, and is low in cost.

Embodiments of the present invention will be explained in detail 1 based on the drawings. As shown in FIGS. 1 and 2, a switching arm 1 serving as a multicolor ribbon switching member has a plurality of colors at one end. A multicolored ribbon 2 divided into two parts is attached, and a bottle 3 with the same name is integrally attached to the other end facing downward, and a bottle 4 is integrally fixed to the bent part of the switching arm 1. , it is pivoted so that it can freely move in a reciprocating arc around the bin 4. And bottle 3
is engaged with b-6 formed over a certain angle on the surface of the cylindrical grooved cam body. Roughly speaking, a gear 7 is integrally inserted into the grooved cam body 5, and the gear 7 meshes with a pinion 9 of a step motor 8. 12 A multicolored ribbon 2 is installed between the two.

In operation of the multicolor ribbon switching device, when the step motor 8 is reciprocated, the gear 7 rotates via the pinion 9, and the grooved cam body 5, which is integrally fixed to the gear 7, also rotates. Then, the pin 3 of the switching arm 1 that engages with the groove 6 formed in the grooved cam body 5 moves smoothly along the groove 6, and as the switching arm 1 rotates around the pin 4, The multicolor ribbon 11 also moves, a predetermined color corresponds to the print head 1o, and a color change is performed. As shown in FIG. 3, the groove of the grooved cam body 5 has a full length 6 inclined with respect to the shaft 14 and a small defined phase 13 perpendicular to the shaft 14, so that when the switching arm 1 is near the start and stop positions, The shape of the curve is perfect for slowing up, slowing down, and moving fast in between. When selecting an arbitrary color using the step motor 8, at the home position of the color,
The step motor 8 is mechanically stopped by overrunning to the end of the vortex 6 of the grooved cam body 5, and further pulses are sent at that stopped position to maintain the out-of-step state until the step motor 8 reaches a constant phase. This is done by stopping the supply of pulses at the specified phase.

FIG. 4 shows another embodiment of the present invention, in which the pulses supplied to the step motor 8 are electrically processed to perform slow-up/slow-down control; in this case, the grooved cam body It can be made into a shape that is uniformly inclined with respect to the foot 14 of No. 5.

As described above, according to the present invention, since the actuating member includes a step motor, inertia load and bouncing of the switching arm that occur due to difficulty in controlling acceleration motion using a solenoid are eliminated, and the switching member By performing slow-up and slow-down control, it is possible to reduce inertial load and eliminate bouncing, and also to perform large force changes of multicolored ribbons smoothly and quickly.

The motor is stopped mechanically by Δ-bar run in one direction, and further pulses are sent until it is synchronized. By using the 2nd tuning J-ru direction d1, the motor can be returned to the home position without the need for a Baum position sensor. There are 19 positions, and the mechanism is simple and low cost.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the entire device including the wooden block according to the light embodiment, Fig. 2 is a partial front view of the same as above, and 5T! 3 is a side view of the cam main body that is similar to that shown in FIG. 1, and FIG. 4 is a side view of the cam main body in another embodiment of the present invention. Multicolored ribbon, 3.4...
・Bin, 5... Full cam body, 6, 6'... Groove, 7...
・Gear, 8...Slump motor, 9...Bignon,
1o...Printing spatula 1~. 11... platen, 12...
... Type paper, 13... Regulation phase, 14... Axis. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a multicolor ribbon switching device for a printer in which an actuation member is connected to a reciprocally movable multicolor ribbon switching member, the actuation member includes a step motor, and the multicolor ribbon switching member and the actuation member are connected to each other when the multicolor ribbon switching member starts and A multicolor ribbon switching device for a printer, characterized in that the device is connected to move slowly near a stop position and quickly at an intermediate position.