JPS60189476A - Correction ribbon feeder for printer - Google Patents

Abstract

PURPOSE:To enable a correction ribbon to be fed at high velocity, by a construction wherein a cam is reciprocatorily rotated in the range of the using position of a correctin ribbon, and a wheel body is continuously rotated in one direction together with a take-up side spool for the ribbon by a pawl of the cam. CONSTITUTION:When correcting a misprinted image, the cam 24 is rotated clockwise, a shaft 19 thereof is supported by a groove 25, and a ribbon support base 6 is raised to an upper correction ribbon using position, thereby facing the correction ribbon 10 to a type part of a daisy wheel 4. When continuously correcting misprinted images, the cam 24 is reciprocatorily rotated relatively to the shaft 19, whereby a ratchet 12 is rotated one pitch together with a spool 11 by the pawl 26 at the time of counterclockwise rotation of the cam 24, and the pawl 26 is retracted from the ratchet 12 against a spring at the time of clockwise rotation of the cam 24. Accordingly, when deviating the base 6 from the correction ribbon using position to a printing ribbon using position, the correction ribbon 10 is fed by one pitch, and an unused part thereof is faced to the type part of the wheel 4, thereby preparing for the next correcting action.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to an erasing ribbon feeding device for a printing machine.

Technical background of the invention and its problems First, a conventional example is shown in FIG. (1) is the platen (2)
This carrier (1) is equipped with a daisy wheel (3) driven by a wheel motor (3).
4) and a printing hammer (not shown) driven by a magnet (not shown). Further, a ribbon support stand (6) is attached to the carrier (1) so as to be able to move up and down with the entire center of the bin (7), and this ribbon support stand (6) holds the ribbon cassette (8) stored in the printing ribbon (8). 9) is detachably attached, and the spool α force around which the erasing ribbon Q□ is wound is rotatably held. There are two spool α forces on the take-up side and the supply side, and a ratchet α, which is a wheel that rotates integrally with the spool α force on the take-up side, is attached to the ribbon support stand (6).

Next, a gear α9 directly connected to the motor (14) and a cam αe are attached to the carrier (1). Teeth αη that mesh with the gear α0 are formed on half the circumference of the cam 0e, and cams are formed on the other half circumference. A groove aυ whose radius from the center of aQ changes is formed, and an axis α fitted into this groove α peak is fixed to the ribbon support (6).Furthermore, the ribbon support (6)
An L-shaped lever is held rotatably around the bottle (c), and one end of this lever is attached to a ratchet (c).
The other end is rotatably held by a support column (A) fixed to the carrier (1).

Therefore, printing is normally performed with the printing ribbon (8) facing the printing part of the daisy wheel (4) as shown in FIG. Although not shown, the printing ribbon (8) is fed in one direction by a known means such as a ribbon feeding motor or a drive shaft that converts the movement of the carrier (1) into rotational movement.

When erasing due to erroneous printing, the motor C14 rotates the cam αQ to raise the ribbon support base (6) and bring the erasing ribbon αQ to face the printed portion of the daisy wheel (4). At this time, the lever (Inc.) rotates around the pin (C), the upper end of the lever (1) swings out, and the ratchet α is rotated by one pitch, so that the erasing ribbon α1 is wound onto the spool α° C. on the winding side.

However, in the conventional device shown in FIG.
By interlocking with the lifting and lowering movements of the ribbon supporting base (6), the ribbon support stand (6) must be moved up and down every time one character is erased. Therefore, there is a problem that the operating speed is slow and the noise is large.

Purpose of the Invention The present invention has been made in view of the above points, and is an erasing ribbon feeding method for a printing machine that can feed the erasing ribbon at high speed without raising and lowering the ribbon support and can reduce noise. The purpose is to obtain equipment.

Summary of the Invention This invention provides a ribbon support holding a printing ribbon and an erasing ribbon, which is provided on a carrier so as to be movable up and down, and a cam provided on the carrier moves the ribbon support up and down to change the printing ribbon usage position and the erasing ribbon usage position. The cam is rotated back and forth within the erasing ribbon use position, and the pawl provided on the cam continuously rotates the p wheel in one direction together with the spool on the take-up side of the erasing ribbon. , when the number of characters to be erased continues, the erasing ribbon is fed quickly without raising and lowering the ribbon support base, and the generation of noise can be suppressed.

Embodiment of the Invention An embodiment of the invention will be described with reference to FIGS. 2 to 6. Components that are the same as those described in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted. On the right side of the ribbon support base (6), a ratchet 02, which is a wheel having a large number of teeth 0.14 formed on its outer periphery, is rotatably attached. In addition, on both sides of the ribbon support stand (6) there is a supply spool 0η,
A spool 0]) on the take-up side that rotates integrally with the ratchet (c) is detachably attached, and an erasing ribbon α1 is attached to the lower side of the printing ribbon (8) on both sides of the tip of the ribbon support stand (6).
A guide (c) is erected to determine the route. Also,
The carrier (1) is provided with a gear 0υ and a cam (c) that are directly connected to a motor α→ that rotates in forward and reverse directions. This cam (C) is formed with teeth α that mesh with the gear αQ and a groove (C) that engages with the axis aO of the ribbon support (6) over about half a circumference. The radius from the center of rotation of the cam (C) to the center of the groove (C) is the position A and B of the groove (C).

It gradually becomes larger in the order of C. The radius of the groove (C) is equal between positions C and D, and in this range, the ribbon support stand (6) is at the upper stage (erasing ribbon used position), position B is at the middle stage (printing ribbon used position), and A The position is at the bottom (printing stop position)
It is. On the outer periphery of the cam (C), between positions C and D, an L-shaped pawl (C) is attached so as to be rotatable nine times around a support shaft (B). This pawl (C) is urged in the direction of the ratchet αa by a torsion spring (C), and the depth of engagement with the ratchet α2 is determined by a stopper pin.

In such a configuration, in FIGS. 2 and 3, the cam (C) supports the shaft α [phase] with the groove (C) at position B, and fixes the ribbon support base (6) at the position where the printing ribbon is used. That is, the printing ribbon (8) faces the type portion of the daisy-wheel (4). Every time one character is printed, the cam rotates counterclockwise and is fixed at the printing stop position at the bottom of the shaft (1!j'e supported by the ribbon support stand (6)) at the position of the person in the groove (c). do.

That is, the print ribbon (8) is deviated below the type part of the daisy wheel (4), and the printed content can be confirmed in an easy-to-see state. During printing, the cam (C) is reciprocated within the range of positions A and H with respect to the axis θ of the ribbon support (6).

To find and erase incorrect printing, rotate the cam (C) clockwise from the state shown in Figures 2 and 3, and turn the shaft α with the groove (C) as shown in Figure 4. support. As a result, the ribbon support stand (6) rises to the upper erasing ribbon use position, and the erasing ribbon OQ faces the type portion of the daisy wheel (4). When erasing continuously, rotate the cam (c) back and forth in the range of positions C and D with respect to the axis (to),
When rotating counterclockwise, the pawl (c) rotates the ratchet (c) one pitch along with the spool α℃, and when turning clockwise, the pawl (c) rotates the torsion spring (c).
flex and retreat from ratchet α. therefore,
When the ribbon support (6) is shifted from the erase ribbon use position to the print ribbon use position, the erase ribbon 00 is fed one pitch, and the unused portion is moved to the daisy wheel (4).
facing the printed area in preparation for the next erasing operation.

In this way, when continuously feeding the erasing ribbon QOt-,
Since the ribbon support stand (6) can be kept stationary, no noise is generated due to switching of the ribbon support stand (6), and the erasing operation is quick.

In addition, the rotation range of the cam (C) and the length of the groove (C) may be shortened, and the switching position of the ribbon support stand (6) may be switched within the range of positions B, C, and D of the groove (C). It is something.

Effects of the Invention Since the present invention is configured as described above, the ribbon support is selectively positioned by the cam at least at the printing ribbon usage position and the erasing ribbon usage position, but the ribbon support is not displaced in the erasing ribbon usage position. The erasing ribbon can be fed by rotating the wheel together with the take-up spool using the pawl provided on the cam without causing any movement. Therefore, the erasing ribbon can be fed quickly and the generation of noise can be suppressed. It has the effect that it can be done.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional example, FIGS. 2 to 6 show an embodiment of the present invention, FIG. 2 is a side view, and FIG.
The figure is a partially enlarged side view showing the state in which the ribbon support is positioned at the print ribbon use position, and Figure 4 is a partially enlarged side view showing the state in which the ribbon support is positioned at the erasing ribbon use position. 5 is a partial plan view showing the relationship between the cam, pawl, and ratchet, and FIG. 6 is a graph showing the relationship between the operation of the cam and the operation of the ribbon support. DESCRIPTION OF SYMBOLS 1... Carrier, 2... Platen, 6... Ribbon support stand, 8... Printing ribbon, 10... Erasing ribbon,
11... Spool, 12... Ratchet (wheel body),
13...Teeth, 14...Motor, 24...Cam, 2
6...Type applicant Tokyo Electric Co., Ltd.' -1187

Claims (1)

[Claims] A carrier that reciprocates facing the platen is provided with a ribbon support that can be raised and lowered to hold the printing ribbon and erasing ribbon in two stages, upper and lower, and the ribbon support is placed on the carrier at least at the printing ribbon usage position and erasing. A cam that is positioned and supported at the ribbon use position is connected to a motor so as to be rotatable back and forth. rotatably provided on the ribbon support base so as to be located near the cam;
An erasing ribbon feeding device for a printing machine, characterized in that the cam is provided with a pawl that feeds the wheel in one direction by rotational movement of the cam in the range of the erasing ribbon use position.