JPS61230970A - Apparatus for changing over position of ribbon - Google Patents

Abstract

PURPOSE:To make it possible to mount multicolor printing function in an extremely easy manner without imparting effect to other parts, by providing a cam for displacing a mount stand for selectively holding monochromatic and multicolor ribbon cassettes and mounting a release body for retracting the detent engaged with said cam from said cam. CONSTITUTION:A multicolor ribbon change-over unit 23 is mounted to a carrier 1. At the time of this mounting, a detent 11 is retracted from a cam 8 by a release body 21 and the cam 8 is rotated by a stepping motor to displace a mount stand 5 and the arbitrary color of the ribbon of the multicolor ribbon cassette 34 is opposed to a printing part 4. When a monochromatic ribbon cassette is used in place of the multicolor ribbon cassette 34, the mount stand 5 is also displaced by the control of the cam 8 to allow the ribbon to oppose to the printing part 4. By this method, parts other than the multicolor ribbon change-over unit 23 are used in common to make it possible to attain the rationalization of production control.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a ribbon position switching device used in a printing machine.

BACKGROUND OF THE INVENTION In general, printing machines capable of multicolor printing require a multicolor ribbon switching device, and are therefore clearly differentiated from popular machines that can only print in different colors.

Problems to be Solved by the Invention Therefore, the two models lack compatibility, and it is difficult not only for the user side but also for the manufacturer side to install a multicolor ribbon switching mechanism in a single color printing machine, which causes problems in production management. is large.

This invention was made in view of these points, and an object of the present invention is to provide a ribbon position switching device that allows a multicolor printing function to be installed extremely easily as needed without affecting other parts. do.

Means for Solving the Problems In the present invention, a mounting table 5 for selectively holding a single color ribbon cassette 40 and a multicolor ribbon cassette 34 is movably connected to a carrier 1. 1
A cam 8 is provided which is displaced in a direction perpendicular to the direction of movement of the cam 8,
A detent 11 that engages with the cam 8 is provided on the carrier 1, and a support base 14 that is detachably attached to the carrier 1 is provided.

A multicolor ribbon switching unit 23 is provided on this support base 14, which is equipped with at least a step motor 18 capable of forward and reverse rotation for rotating the cam 8, and a release body 21 for retracting the detent 11 from the cam 8.

Function: In models that perform only monochrome printing, the multicolor ribbon switching unit 23 is not attached to the carrier 1.

In this case, the positioning of the cam 8 in the rotational direction is determined by the detent 1.
1, and the position of the mounting table 5 is determined by the cam 8 fixed so that the ribbon 41 of the monochrome ribbon cassette 40 faces the printing section 4.

In a model that performs multicolor printing, a multicolor ribbon switching unit 23 is attached to the carrier 1. At this time, the detent 11 is retracted from the cam 8 by the release body 21, the cam 8 is rotated by the step motor 18, the mounting table 5 is displaced, and an arbitrary color of the ribbon 35 of the multicolor ribbon cassette 34 is placed opposite the printing unit 4. let When a single color ribbon cassette 40 is used instead of the multicolor ribbon cassette 34, the mounting table 5 is displaced under the control of the cam 8 to transfer the ribbon 41 to the printing section 4.
to face.

Example An embodiment of this invention will be described based on the drawings.

A printing unit 4 is provided which includes a print head 2 mounted on a carrier 1 and a platen 3. A mounting table 5 is rotatably held on the carrier 1 by a shaft 6. Further, a cam 8 having a protruding spiral 7 formed on the outer periphery of the carrier 1 is rotatably held with its axis in the moving direction of the mounting table 5, and a recess is formed on the outer periphery of the cam 8. A detent 11 having a protrusion 10 that engages with the detent 10 is biased counterclockwise and rotatably held by a shaft 12. Further, on the right side of the mounting table 5, a bin 13 for holding the spiral 7 is provided upright.

A support stand 14 is then provided. The carrier 1 is formed with grooves 15 that slidably hold both sides of the support base 14 and locking claws 17 that resiliently engage with protrusions 16 projecting from the upper surface of the support base 14. Then, a step motor 18 that can freely rotate in forward and reverse directions to which a drive gear 20 that meshes with a gear 19 fixed to a cam 8 is directly connected, a shaft-shaped release body 21 that contacts the detent 11, and a connector 22 are attached to the support base 1.
4, the multicolor ribbon switching unit 23
is formed. A multicolor ribbon detection switch 25 is connected to a flexible cable 24 connected to the connector 22. This multicolor ribbon detection switch 25 is inserted into a recess 27 formed in the mounting table 5, and is operated when an actuator 26 is pressed by a projection protruding from the bottom of a multicolor ribbon cassette 34, which will be described later. A PC board 28 fixed to the bottom of the carrier 1 holds a connector 29 connected to the connector 22, a connector 30 connected to an external circuit, a detector (not shown) for detecting the home position of the carrier 1, etc. There is.

Further, the carrier 1 is provided with an adjustment mechanism 31 that displaces the cam 8 in the axial direction. This adjustment mechanism 31 is the fourth
As shown in the figure, a cylinder 32 that slidably holds the cam 8
It consists of an adjustment spiral 33 that is screwed into this cylinder 32 and presses down the cam 8, and a spring 34 that biases the adjustment spiral 33 in the axial direction.

The step motor 18 rotates 15 degrees in one step. The reduction ratio by gear 19.20 is 1/2. The helix 7 has a length of approximately 270 degrees with a rotation angle of 4% 8;
As shown in FIG. 5, the number of flat portions 44, 45, 4 corresponding to the number of colors of the ribbons 35 of the multicolor ribbon cassette 34 is located in the middle.
6.47 are formed at equal intervals. These flat parts 4
The lengths 4, 45, 46, and 47 are four steps of the step motor 18, and the rotation angle of the cam 8 is 30 degrees.

The ribbon 35 of the multicolor ribbon cassette 34 is color-coded into four zones 36, 37, 38, and 39, as shown in FIG. As shown in FIG. 7, the ribbon 41 of the single-color ribbon cassette 40 has a zone width equivalent to two ribbons 35, but by forming a Mebuus loop, half the areas 42 and 43 are used. It is something.

In such a configuration, the multicolor ribbon switching unit 23
When the release body 21 is attached to the carrier 1, the release body 21 is attached to the detent 1.
1 is retracted from the cam 8, and the drive gear 20 meshes with the gear 19 of the cam 8.

When the multicolor ribbon cassette 34 is mounted on the mounting table 5 in this state, the multicolor ribbon detection switch 25 is activated by the step motor 1.
A signal is issued to permit driving of 8.

When the step motor 18 is driven, the cam 8 rotates and the mounting table 5 is rotated in the vertical direction. When the pins 13 of the mounting table 5 are sequentially lifted to the flat parts 44, 45, 46, 47, the mounting table 5 is displaced as shown in a, b, Q, and d in Fig. 8, and the color is switched. . The position a is the home position, and even if this position is slightly out of order, the flat part 4 of the spiral 7
4.45° and 46.47° are formed, so each switching position is accurate.

Of course, by turning the adjustment spiral 33 and slightly moving the cam 8 in the axial direction, the home position a of the mounting table 5 can be accurately determined.

It is also possible to use the single color ribbon cassette 40 with the multicolor ribbon switching unit 23 attached.

In this case, as shown in FIG. 9, printing is performed with the mounting table 5 positioned at position C. Since the ribbon 41 is formed with a Mebuus loop, the mounting table 5 may be positioned at the position d.

For models that do not use the single-color ribbon cassette 40L, the multi-color ribbon switching unit 23 need not be attached to the carrier 1. In this case, the protrusion 1.0 of the detent 11 determines the rotational position of the cam 8, Position the stand 5 at position C shown in FIG.

Note that the work of attaching and detaching the support stand 14 to the carrier 1 can be performed with one touch without using any tools. In both models that use the multicolor ribbon cassette 34 and models that use only the single color ribbon cassette 40, the multicolor ribbon switching unit 2
Parts other than 3 can be used in common.

Effects of the Invention Since the present invention is configured as described above, it is possible to divide the model into a model that uses only a single color ribbon cassette and a model that uses a multicolor ribbon cassette simply by selecting the presence or absence of a multicolor ribbon switching unit. This has the advantage that parts other than the multicolor ribbon switching unit can be used in common, thereby streamlining production management.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is a plan view showing a state in which a multicolor ribbon switching unit and a multicolor ribbon cassette are attached to a carrier, and FIG. A side view showing a state in which a multicolor ribbon switching unit and a multicolor ribbon cassette are attached to a carrier, FIG. 4 is a longitudinal side view showing an enlarged view of the adjustment mechanism, FIG. 5 is a developed view of the spiral of the cam, and FIG. Figure 7 is a plan view showing a multicolor ribbon, Figure 7 is a plan view showing a single color ribbon, Figure 8 is a side view showing the ribbon switching operation of the multicolor ribbon cassette, and Figure 9 is a side view of the single color ribbon cassette. FIG. 3 is a side view showing a printing position. 1... Carrier, 4... Printing section, 5... Mounting table,
7...Spiral, 8...Cam, 11...Detent,
14... Support stand, 18... Step motor, 21...
...Release body, 23...Multicolor ribbon switching unit, 31
...Adjustment mechanism, 34...Multicolor ribbon cassette, 35
...Ribbon, 40...Single color ribbon cassette, 41.
・・Ribbon~A2 Figure, %, 3 Figure J3u Figure J) ○Country

Claims (1)

[Claims] 1. A mounting table for selectively holding a single color ribbon cassette and a multicolor ribbon cassette is connected to the carrier so as to be movable in a direction orthogonal to the moving direction of the carrier, and the mounting table as described above is connected to the carrier. A day tent is provided on the carrier and is detachably attached to the carrier, and a day tent is provided on the carrier to elastically engage the cam and position the monochrome ribbon cassette at a printing position together with the placement table. A multicolor ribbon switching unit is provided, the multicolor ribbon switching unit being provided with a support stand, and at least a step motor capable of forward and reverse rotation for rotating the cam and a release body for retracting the daytent from the cam are attached to the support stand. Ribbon position switching device. 2. A mounting table for selectively holding a single color ribbon cassette and a multicolor ribbon cassette is connected to the carrier so as to be movable in a direction perpendicular to the moving direction of the carrier, and a spiral is provided on the carrier to engage with the mounting table. A cam for displacing the mounting table is rotatably provided with an axis in the direction of displacement of the mounting table, and is resiliently engaged with the cam to print the monochrome ribbon cassette together with the mounting table. A day tent for positioning is provided on the carrier, a support base is provided on the carrier in a detachable manner, and a step motor capable of forward and reverse rotation is provided on the support base to rotate at least the cam, and the day tent is retracted from the cam. 1. A ribbon position switching device comprising: a multicolor ribbon switching unit to which a release body is attached; and an adjustment mechanism provided on the carrier to vary the axial position of the cam.