JPS5941094Y2 - Small printer type selection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small printer, and particularly to a mechanism for selecting a desired typesetting in a typewheel selection type printer.

The purpose of the present invention is to prevent the ink transferred to the type wheel from flowing into the electromagnetic means through the selection pawl by providing the selection pawl with a full flange.

FIG. 1 is a side sectional view showing a specific example of the present invention, and the present invention will be described in detail below with reference to FIG.

Referring to FIG. 1, reference numeral 1 denotes a type wheel shaft having a groove 24 on the outer periphery, and a type wheel 4 having all the type characters 3 is supported on the outer periphery.

Reference numeral 5 denotes a type wheel pawl rotatably attached to a shaft 6 provided on the measuring surface of the type wheel 4, and the pawl portion 51 engages with a type ring spring I attached to the type wheel 4, causing the pawl portion 51 to rotate on the type wheel shaft 1. A force is applied in the direction of arrow a so as to engage the groove portion 2.

Reference numeral 8 denotes a detent spring which engages with a protrusion 9 integrally provided on the type wheel 4 when the type wheel 4 is in a standby state, and determines the amount of the standby position of the type wheel 4.

Reference numeral 10 denotes a selection pawl, which controls engagement/disengagement between the pawl portion 51 of the type wheel pawl 5 and the groove portion 2 of the type wheel shaft 1 by engaging and disengaging with the head 52 of the type wheel pawl 5.

Reference numeral 11 designates a selection pawl shaft which carries a selection pawl with a 10-karat gold bearing and is fixed to a magnetic circular plate made of 12-karat gold and rotates completely in the direction indicated by the arrow.

Reference numeral 13 denotes an iron core, which is inserted into the center of the coiled coil frame 14 so as to be slidable in the directions of arrows g and h, and the notch 131 provided at the tail portion is the end face of the yoke 15 which is bent once. The head 132 is arranged so as to maintain a slight gap 4 with the measured surface of the disc 12 or to slide thereon.

Reference numeral 16 denotes a trigger case which holds the coil frame 14 and also has a bearing portion which supports the selection claw 10 on a metal shaft.

A hammer 17 faces the printing paper 19 at the printing position 18 of the type 3 and performs four printing operations.

Reference numeral 20 denotes an ink roll, which completely transfers ink to the type 3 by rolling it into contact with the type wheel 4.

The operation of the type selection mechanism constructed as described above will now be explained.

In the standby state, the selection pawl 10 is rotated in the direction of the arrow e by the spring force of the selection pawl spring 21, and remains stationary as the type ring hits the four metals.

Further, the head 52 of the type ring claw 5 and the head 101 of the selection claw 10 are in contact with each other, and the type ring claw 5 is rotated in the direction of arrow d.
The engagement between the claw portion 51 and the groove portion 2 of the type wheel shaft 1 is disengaged.

In this state, the titent spring 8 engages with the projection 9 of the type wheel 4 and holds the type wheel 4 □, so that the type ring pawl 5 prevents the engagement between the pawl 51 and the groove 2 of the type wheel shaft 1. It is held in a detached state.

In the type selection process, the type wheel shaft 1 rotates in the direction of arrow C.

Further, the selection pawl shaft 11 is also rotated in the direction indicated by the arrow, so that the 12-metal disc fixed to the selection pawl shaft 11 is rotated integrally with the selection pawl shaft 11.

The groove portion 2 corresponding to the type 3 that needs to be printed is the type ring claw 5.
When the coil 22 is energized four times and the electromagnetic means described later is operated, the selection claw is rotated in the direction of arrow f against the spring force of the 10-karat gold selection claw spring 21, and the type ring claw 5 4. Disengage the head 52 of the head 52.

The type ring claw 5 which is disengaged from the selection claw 10 rotates in the direction of arrow a due to the spring force of the type ring spring 7, engages with the groove 2 of the type wheel shaft 1, and rotates in the direction of arrow C. It begins to rotate 4 in unison with the type wheel spindle 1.

At this time, the type ring 4, which is integrated with the type ring pawl 5 and the shaft 6, does not rotate, and the type 3 to be printed comes into contact with the ink roll 20 on the way, and after the ink 4 is transferred, it continues to rotate until it reaches the printing position 18. It will be done.

The same operation is performed for each digit, and when all the characters 3 to be printed are lined up in the printing position 18, the hammer 17 is moved to the printing paper 1.
The 9e contacts the printed character 3 at 4 and prints 4 times.

This completes the character selection and printing process. Next, the operation of the electromagnetic means mentioned above will be explained.

When the coil 22 is energized, the iron core 13. The magnetic circuit composed of the yoke 15 and the disc 12 is closed, and the surface of the disc 12 and the side surface of the head 132 of the iron core 13 are attracted.

Then, the iron core 13 turns into a disk 120 rotating in the direction of the arrow.
The rotating force receiver is pushed down in the direction of arrow g, and the protrusion 102 of the selection claw 10 engaged with the iron core 13 is pushed down, causing the selection claw 10 to rotate in the direction of arrow f.

Here, the head 101 of the selection claw 10 and the head 52 of the type ring claw 5
is disengaged.

After the engagement is released, when the current to the coil 22 is cut off, the disc 1
2 and the head 132 of the iron core 13 are released and the engagement is separated.

Then, the selection pawl 10 is rotated in the direction of arrow e by the selection pawl spring 21 and returns to the standby state.

After printing is completed, there is a return process in which each selected type wheel 4 is returned to its standby position.

In the return stroke, the type wheel set 1 moves in the direction of arrow C as in the selection stroke.
Rotate once in the direction.

At the same time, the type wheel pawl 5 engaged with the groove 2 of the type wheel shaft 1 also rotates □, and the type wheel 4 also rotates together.

When the type 3 of each type wheel 4 rotates near the standby state, the head 101 of the selection pawl 10 and the head 52 of the type wheel pawl 5 rotate in the direction of arrow e by the selection pawl spring 21 and return.
contact again, the type ring claw 5 rotates in the direction of arrow d, and the claw part 5
1 is disengaged from the groove 2 of the type wheel shaft 1.

At this time, the detent spring 8 engages with the protrusion 9 of the type wheel 4 to force the type wheel 4 to stand still, so that the type ring pawl 5 is held in the state 11 is disengaged from the groove 2 of the type wheel shaft 1. .

As each type wheel 4 returns, the incorrect selection prevention shaft 23
rotates in the direction of arrow i in four rows, and the outer peripheral part 231 and the selection claw 10
4 is brought into contact with the protrusion 103 of.

As a result, in the standby position, the selection pawl 10 rotates in the direction of the arrow f due to external forces such as vibrations and shocks, and the type ring pawl 5 moves to the type ring 1.
This prevents erroneous selections and smearing by engaging with the groove 2 of the holder.

In addition, the incorrect selection prevention shaft 23 rotates in the direction of arrow i just before the next selection process starts, and a notch 232 □ is provided at the portion facing the protrusion 103 of the selection pawl 10 so as not to interfere with the operation of the selection pawl 10. It has become.

This completes the operation of one printing cycle.

In this structure, when no type setting is selected, the type wheel shaft 1 only rotates four times, and the other parts do not operate four times.

In addition, compared to the conventional method in which the force necessary for the return stroke in the selection stroke is stored in a spring, and this spring force reverses the type wheel axis to perform four return steps, this structure allows the type wheel to move in one direction. Perform 2 selection returns by rotation.

These features make it possible to operate with the lowest power consumption and the average power per printing cycle.

For this reason, it has become possible to provide a compact printer that can be driven by dry batteries or the like, and has a wide range of uses without requiring any restrictions such as a power source.

The most significant feature of the electromagnetic device 6 that drives the selection claws 10 is a magnetic circuit made up of rotating disks 12 and 5, and an iron core 13 and a yoke 15 that are adjacent to the disks 12 with a small gap.

Conventionally, in order to allow a worker to make a large stroke using an electromagnet, the suction distance had to be large, which increased magnetic loss and resulted in poor efficiency.

Furthermore, if the suction distance is increased to a predetermined stroke using a lever or the like in order to reduce the loss 4, the efficiency will be poor due to friction loss of the lever, etc.

In the structure according to the present invention, the suction distance between the disc 12, the iron core 13, and the yoke 15 is minute and has no relation to the predetermined stroke, and only serves to generate the suction blade, and the predetermined stroke is determined by the driving force of the motor, etc. Since it is configured to be obtained by rotating the disc 12, the attraction distance is very small, magnetic loss is small, and a large attraction force can be obtained with low power consumption.

Furthermore, the electromagnet can have a very fast response.

Since the efficiency of a motor is usually ten times higher than that of an electromagnet, the overall selection energy can be significantly reduced compared to when using only an electromagnet.

Being able to operate with low power consumption means that the coil windings and the like need only be small, which not only makes it possible to downsize, but also significantly reduces component costs and assembly costs.

Since the present invention uses the entire ink roll as an inking means, ink is always transferred to the type 3, and when the type wheel 4 is rotated repeatedly, the selection nail adjacent to it Ink gradually adheres to 10 as well.

When the ink attached to the selection claw 10 flows around the electromagnet mentioned above, the rotation of the selection claw 10 and the selection claw shaft 11 becomes difficult, or it gets stuck between the attraction surfaces of the disk 12 and the iron core 13 and becomes attracted. This can lead to loss of ability and other negative effects.

For this purpose, a flange 104'k which is thicker than the thickness near the head 101 is provided in the vicinity where the selection pawl 10 comes out of contact with the type wheel 4. This flange 104 guides ink in the direction of the ink flow changing projection 103, and the selection pawl axis. 11, disk 12, etc., to prevent ink from flowing into the grooves.

The brim 104 of this selection claw 10 has a shape as shown in a perspective view in FIG.

(The numbers in Figure 2 are the same as in Figure 1.

) By using a selection claw with such a shape, it is possible to reliably prevent ink from flowing in and create a highly reliable electromagnetic structure without increasing the number of parts.

Next, regarding the structure for preventing erroneous selection, the erroneous selection prevention shaft 23 makes contact with the protrusion 103 of the selection claw 10 at the outer peripheral portion 231, thereby completely preventing the selection claw 10 from malfunctioning.

Normally, the outer circumferential surface of a round bar is highly accurate, and the engagement position of the selection claw 10 with the protrusion 103 can be easily achieved.

Furthermore, since the outer circumferential portion 231 engages with the protrusion 103 of the selection claw 10, the rotation angle of the wrong selection prevention shaft 23 is very rough, and the precision of the parts is not required, resulting in an inexpensive structure.

Furthermore, the area near the protrusion 103 of the selection claw 10 is made to have a spring force so that it has some bite with the outer periphery 231 of the erroneous selection prevention shaft 23 for spring engagement, thereby preventing the erroneous selection prevention shaft 23 from occurring due to variations in component precision. There is no gap between the protrusion 103 of the selection claw 10, and a structure that more completely prevents erroneous selection can be achieved, and the precision of the parts can be made rougher and cheaper.

Since the spring part is integrally provided near the protrusion 103 of the selection claw 10 as described above, the cost of the part for providing the spring retaining structure does not increase.

As explained above, according to the present invention, the flange metal selection claw that protrudes in the thickness direction of the selection claw is provided with a structure that blocks the quantity between the type ring and the disc, so that the ink transferred to the type ring is Due to the potency of buckwheat, it flows into the disk.

Therefore, since the disk, which is one of the components of the electromagnetic means, is not affected by ink, malfunctions and erroneous selections do not occur when selecting printed characters.

This effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating a specific example of the present invention, in which 1 is a type wheel shaft supporting a type ring 4, 5 is a type ring pawl, 7 is a type ring spring, 8 is a detent spring, and 16 is a selection pawl 10. , selection claw shaft 11, disc 12, iron core 13, trigger case that holds the 22-karat gold coil, 15 is the yoke, 17 is..., 1
9 is printing paper, 20 is an ink roll, 21 is a selection spring, 2
3 is an axis for preventing incorrect selection. FIG. 2 is a perspective view showing the shape 4 of the selection claw in the present invention, 10 is the selection claw, 11 is the selection claw shaft, 12 is a disc, 13
is an iron core.

Claims (1)

[Scope of utility model registration request] a plurality of type wheels, a selection claw rotatably supported on a shaft and having one end located between the type wheels, a disk fixed to the shaft, and a selection claw having one end of the disk. An iron core facing the side surface, and a coil that is movably movable and selectively magnetically coupled to the iron core and the disk to operate the selection claw and move the selection of the type on the type wheel. A type selection mechanism for a small printer, characterized in that a brim surrounding the disk is provided between the type wheel and the disk in the thickness direction of the selection claw.