JPS6067181A - Type wheel selecting type printer - Google Patents

Abstract

PURPOSE:To prevent component parts of a type wheel from being abraded, broken or damaged and obtain a highly reliable printer free of misprinting, by a method wherein a type wheel resetting operation is effected through gears. CONSTITUTION:When an intermittent gear 5 is rotated in the direction of an arror A by motive power of a motor, the first driven gear 401 of a selecting gear is rotated by the first driving gear 501. A type wheel shaft 2 fixed to the gear 401 is rotated in the same direction, and the type wheel is also rotated by the function of a type wheel spring. Since a detecting plate fixed to the shaft 2 is also rotated, a signal corresponding to the movement of the type wheel is provided by a detector. An electric current is supplied to an electromagnet in synchronism with the signal to operate a lever, therby selectively positioning the type wheel at a predetermined position. Although the type wheel is stopped at this position, the type wheel shaft 2 is rotated further, and one end of the type wheel spring is disengaged from a V-groove of the shaft 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a type wheel selection type printer, and more particularly to control of rotation of the type wheel.

<Conventional example> The conventional type wheel selection type printer is
In the process of selecting the type wheel as shown in 9, the rotation of the reciprocating rotary shaft is performed by a gear, and in the process of resetting the type wheel, rotation is performed by a torsion coil spring provided on the reciprocating rotary shaft. However, in such F4 type printers, during the type wheel reset process, especially in low temperature conditions, the type wheel is reset by hardening of lubricating oil, grease, etc. k / −G h
4 do h 1 no I reno (÷ 41) (÷ 91
- There were other problems such as not being able to fully reset the device.

Also, when resetting with a torsion coil spring, the type ring spring 29 is hooked through the notch 21 provided in the reciprocating rotation shaft 20, as shown in FIG. 1, and the type ring 22 is reset. Since there is no speed control of the reciprocating rotation shaft 20, the reciprocation rotation shaft 20 and the type ring spring 29 move at a very high speed.
As shown in FIG.
? Problems such as wear at point 1 and breakage at point 8 and point b due to bending stress occurred. These naturally lead to erroneous printing when printing, which is a big problem.

Also, in recent years, there are many demands for higher speed printers, but as mentioned above, if it is difficult to reset the type wheel at a particularly low temperature during the process of resetting the type wheel, it is necessary to spend that much time resetting the type wheel. However, there was a drawback that the overall printing speed decreased and it was not possible to increase the printing speed.

The purpose of the present invention is to eliminate such drawbacks, and its purpose is to provide a highly reliable printer that eliminates troubles such as wear and bending of the main parts used for type wheel selection and is free from printing errors. It is in.

Furthermore, it is an object of the present invention to provide a printer that is faster by reliably performing the type wheel reset process using gears.

<Example> The present invention will be explained using FIG. 1, FIG. 2, and FIG. 3.

1 is a type wheel arranged on the type wheel shaft 2 by the number of digits. There are three type ring springs, one end of which engages with the groove 101 of the type ring, the other end of which frictionally engages with the type wheel shaft 2, and the center of which has a springy portion. It is a selection gear fixed to the 4-digit type wheel shaft 2,
A first driven gear 401 and a second driven gear 402 are provided.

5 is a first drive gear 5 that engages with a first driven gear 401 in order to rotate the type wheel shaft 2 in the forward direction (selection stroke of the type wheel);
01 and a circular projection 502 for locking the selection gear during the printing stroke, and engages with the maintenance gear 6 for reversing the type wheel shaft (reset stroke of the type wheel). Second drive gear 505
This is an intermittent gear having a circular arc-shaped protrusion 504 that locks the selection maintenance gear at the end of the type O reset. The maintenance gear is the second driven gear 402 of the selection gear and the troubled gear 6.
01, and a gear 602 that meshes with the second driving gear 505 of the intermittent gear.

7 is a detection plate having a slit 701 fixed to the type fmf+lI2, and 8 is a detector provided with a light emitting element and a light receiving element by replacing the detection plate. 9B, the positioning device fixing the ends of the maintenance gear @10 supporting the maintenance gear 6 and the intermittent gear shaft 11 supporting the intermittent gear 5 is temporary and made of plastic.

The centers of the maintenance gear @10, the intermittent gear shaft 11, and the type wheel shaft 2 are arranged at substantially triangular positions. The I operation of such a type wheel selection type printer consisting of 114 components will be explained next.

The operation consists of a type wheel selection process, a printing process, and a type wheel reset process. First, in the type wheel selection process, when the intermittent gear 5 rotates in the direction of arrow A due to the μmb force of the motor, the first drive gear 501 moves to <u q r ha/! of the selection gear.
I! -JII++, e, y/n' 4 -z-1
yv: z 1L > y, iz a + Type wheel fixed to driven gear 401! 1Ib2 rotates in the same direction, and the type ring 1 also rotates in the direction of arrow B due to the action of the type ring spring 3. Since the detection plate 7 mounted on the type wheel shaft 2 also rotates, a signal corresponding to the movement of the type wheel 1 can be obtained by the detector 8, and in synchronization with this signal, the signal is sent to an electromagnet (not shown). 1. Move the lever 12 to select the predetermined position of the type wheel 1. The type wheel 1 stops at this position, but the type wheel shaft 2 still rotates, so the type wheel spring 6
One end comes off from the V groove 201 of the type wheel shaft 2.

A predetermined character is selected at the printing position by the same operation for all digits during one rotation of the type wheel spindle 2 or the spindle. Next, in the printing process, the selection gear 4 is displaced by the arcuate protrusion 502 of the intermittent gear 5, and the type wheel set 2 is stopped.

During this time, the printing roller 13 is moved between the printing paper 14 and the ink ribbon 1.
5 to press the selected characters to print the characters on the printing paper 141c. In the type wheel reset process, the direct meshing between the intermittent gear 5 and the selection gear 4 is removed, and the second driving t + b wheel 506 of the intermittent gear 5 and the original selection maintenance Id wheel (0m 602 and meshing A selection) are performed. m N#L4 tx' % +1 Rotate in direction C. At the same time, type wheel shaft 2 also rotates in the same direction, and type ring spring 30301 is pulled to v7 1201.It) returns type wheel 1 to its original position. Return to During the final part of the return of the type wheel set 2, the transmission gear 6 is locked by the circular projection 504 of the intermittent gear 5 so that the type wheel set 2 does not bounce.

According to this type of XJ structure, the reset stroke of the type wheel is also controlled by gears, so the speed is constant, and the V of the type wheel axle during the type wheel nut stroke, the 501 group of the fi-4201 and the type ring spring 6. Is the collision with Tl1lJ? It is in a rolled state, and there is no wear on the ramming part, no breakage of the type ring spring 5, etc.

In addition, in a low temperature state, the mechanical load becomes large and the type wheel 1 cannot be reset, but in this+fAM, the type wheel 1 is reset by gear feeding, so the type wheel 1 is forcibly fed and there is no problem. ■If the load for resetting the type wheel 1 is large, the maintenance gear shaft 10 may be bent, and if it is bent, the ridge that rotates the maintenance gear 10 will become smaller, and the gears may not mesh because they do not rotate to a predetermined state. This may cause some trouble, but since the distance between the axes is 1nIJ with the positioning plate 9 in this purchase, there is no deflection, and normal viewing rotation can be obtained without any trouble. Since the intermittent gear 5 and the maintenance gear 6 expand and contract due to temperature changes, the maintenance gear 6 at the last part of the return of the type wheel shaft 2 in the above-mentioned type wheel reset process is locked by the intermittent gear 5. Sometimes, at low temperatures, intermittent gear 5
A gap is created between the transmission gear 6 and the transmission gear 6, causing backlash and causing the maintenance gear 6 to bounce.Also, at high temperatures, the amount of mesh per gear increases and the load becomes extremely large.
Since the positioning plate 9 is also made of plastic, the positioning plate 9 shrinks at low temperatures, and since the type wheel is reset by the Tado feed, it will work reliably even if the time spent in the type wheel reset process is shortened. This makes it a high-speed printer. The distance between the intermittent gear 1 and the maintenance gear is shortened, and at high temperatures the position 1 base determining plate 9 is offset in the direction of increasing the distance between the axes. Even with the face width, the locking relationship between the intermittent tooth 5 and the transmission gear 1 set 6 is always inconsistent.

Furthermore, since the positioning plate is fixed to +LL1# provided on each shaft using the Pasochin method, extension parts such as an E-type retaining ring are not required, and the number of parts and assembly man-hours can be reduced.

<Effects> As explained above, according to the present invention, there is no wear or breakage of the type ring spring, which is the main part for selecting the type ring.
We can supply highly reliable printers.

Since the resetting process of the type wheel is controlled by gears, it is possible to provide a printer that can reliably reset the type wheel even in low τ product conditions and is capable of increasing speed.

Since the Zaraanifu invention uses a positioning plate, there are problems caused by the precision of one rotation of the type wheel spindle due to shaft separation, and bounce of the type wheel spindle due to intermittent gears at low temperatures and backlash caused by selective maintenance. It is possible to provide a printer that can prevent troubles such as heavy loads caused by increased meshing of intermittent gears and selective maintenance gears at high temperatures. In this way, the initial purpose can be achieved, and the effect is great.

[Brief explanation of the drawing]

Figures 11, 2, and 5 are a plan cross-sectional view of Gutai 1 chestnut, a side lI side view of the type ring, and II Rinyu 11g.
1 (01111 side view. Fig. 4 is a -Jμ sectional view of a conventional type wheel selection type plug 1 nonk. 1 is a type ring, 2 is a type ring portion h, 5 is a type ring spring, and 4 is a selection). Gear 5 is an I-mouth intermittent gear, 6 is a maintenance gear 9 is a positioning plate, 10 is a maintenance gear hh, 11 is an intermittent gear shaft, and 20 is a reciprocating gear I auxiliary shaft.

Claims (1)

[Claims] A type wheel having type on its surface, a type wheel shaft having a VS and bearing the type wheel, a part of which is engaged with the type wheel, a part of which is frictionally engaged with the type wheel axle, and has a springy part in the center. a type wheel spring having a first driven gear and a second driven gear fixed to the type wheel shaft;
a selection gear having a driven gear; a transmission gear guide provided adjacent to the type wheel shaft; a gear rotatably supported on the transmission gear shaft and meshing with the @2 driven gear; and a transmission gear for transmission. a transmission gear having a gear, an intermittent gear shaft provided at a position where the centers of the type wheel shaft and the transmission gear shaft form a substantially triangular shape, and a type wheel rotatably supported on the intermittent gear shaft. A first driving gear that meshes with the first driven gear during the selection stroke, an arcuate protrusion that locks the selection gear during the printing stroke, a type wheel reset line, and the transmission gear at the end of the type wheel reset stroke. A type wheel selection comprising an intermittent gear having a circular projection for locking a wheel, and a positioning plate fixed to position the tips of the transmission gear shaft and the intermittent gear shaft. type printer.