JP2688885B2 - Printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus which prints by pressing a printing roller on the surface of a printing type wheel.

[0002]

2. Description of the Related Art Conventionally, in a printing apparatus such as that disclosed in Japanese Patent Publication No. 2-14199, when the printing roller rolls to print, the height of the printing roller is slightly higher than the printing characters on the type wheel. The type wheel is lowered by the reaction force of the compression bullet, and when the printing roller is further rolled, the type wheel is pushed up against the compression bullet, and the type wheel repeats this operation. However, since the volume of the type wheel is large and the inertia is large, if the rolling speed of the printing roller is too high, the movement of the vertical amount of the type wheel may not be able to follow up completely. The result is not done.

[0003]

In order to eliminate the drawbacks of the above apparatus, the present invention reduces the inertia of the type wheel in order to make the vertical movement of the type wheel follow the rolling speed of the printing roller. However, it is an object of the present invention to enable the printing roller to reliably print the character surface of the type wheel.

[0004]

SUMMARY OF THE INVENTION The present invention is a device for printing by moving a type wheel by a switch and rollingly moving an opposing print roller to print a part of a large gear provided on a main fixed shaft of a drive mechanism. Is provided with a roller, and the roller is engaged with a long hole of a lever which is pivotally attached to a support shaft located at a distant position, and is provided at an upper part of a long hole provided at an opposite end of the lever. A roller provided below the slide block is engaged, and the rotation of the large gear is transmitted to the roller to thereby horizontally swing the lever to linearly move the slide block. A print roller is rotatably installed on a support fitting provided on the upper surface, and an upper cam and a lower cam are provided on the upper side of the main fixed shaft of the large gear,
A slide plate is installed between the upper end of the main fixed shaft and the support shaft, the upper cam is brought into contact with a roller provided on the lower surface of one end of the slide plate, and the lower cam is placed on the opposite side of the roller. The upper cam and the lower cam rotate with the rotation of the large gear by contacting the provided roller, and the lower cam surface presses against the roller to move the slide plate, and the groove hole provided at one end of the slide plate. A swing plate that pivots around the lower shaft of the bracket is pivotally attached to the top of one end of the lever with the shaft provided at the upper end of the fixed bracket as a fulcrum in a long groove provided at the upper end of the swing plate. The shaft is inserted, the swing plate is rotated clockwise about the lower shaft, the lever is rotated counterclockwise about the shaft, and the other end of the lever is connected to the shaft at one end of the arm. To the type wheel arm with the other end of this arm A printing apparatus comprising such swings the character ring arm via a support shaft of a base end portion.

[0005]

This device inserts the paper or the like to be printed between the type wheel and the printing roller, lowers the type wheel with a switch, and at the same time rolls the printing roller to perform printing.

The motor rotates a large gear about a main fixed shaft via a gear and a worm.

In FIG. 2, the rotation of the large gear causes the lever to oscillate in the direction of arrow χ by the rotation of the roller, whereby the slide block linearly moves in the direction of arrow ◯ with the guide bar as a guide.

As a result, the printing roller pinches a paper or the like between the printing roller and the printing wheel, and linearly moves in the arrow direction while rotating.

In FIG. 3, the upper cam moves the slide plate to the left by pressing the roller on the upper surface of the cam, and the lower portion of the lower cam that contacts the roller contacts the lower portion of the cam surface. Therefore, there is no hindrance to the left movement of the slide plate.

With the rotation of the large gear, the upper cam and the lower cam also rotate, and the lower cam surface presses the roller to move the slide plate to the right. At this time, the upper cam in contact with the roller pushes against the upper cam surface and moves to the lower portion of the cam, and does not hinder the rightward movement of the slide plate.

FIG. 1 is a state diagram in which the slide plate is shifted to the left side, and FIG. 4 is a state diagram in which it is shifted to the right side.

When the slide plate is moved to the right, the swing plate is rotated clockwise about the lower shaft, and the lever is rotated counterclockwise about the shaft.

In FIG. 1, when the high surface of the upper cam pushes the roller to move the slide plate to the left,
The swing plate rotates counterclockwise about the lower shaft, and the counterclockwise rotation of the swing plate causes the lever to rotate clockwise about the shaft. By rotating the shaft clockwise,
The shaft of the type wheel arm is pulled up by the arm, and the type wheel arm moves up around the support shaft.

In FIG. 4, when the lower cam presses the roller to move the slide plate to the right, the swing plate rotates clockwise about the lower shaft. At this time, the lever
Rotate counterclockwise about the shaft to move the shaft to the position shown in Fig. 1 to Fig. 4 (a state where it is almost directly below), and push down the shaft of the type wheel through the arm to center the support shaft. As a result, the printing wheel arm is lowered and the printing wheel attached to the tip of the printing wheel arm is lowered until it comes into pressure contact with the printing roller.

The vertical movement of the type wheel arm has been described with reference to FIG. 6, but the state diagram A corresponding to FIG. 1 shows the state when the type wheel arm is raised by θ °, and corresponds to FIG. State diagram B shows the state when the type wheel arm is descending.

In state diagram A, when the shaft moves in the direction of the arrow around the shaft whose position does not change, the shaft descends around the support shaft. That is, when the type wheel is lifted in the direction, the lever operates in the direction of and the type wheel arm tilts upward.

In the state diagram B, even if the type wheel is lifted in the direction, the type wheel arm does not sway unless the lever and the arm are broken or buckled.

[0018]

Example: This apparatus inserts a paper a to be printed between the type wheel 1 and the printing roller 2 and lowers the type wheel 1 by a switch, and at the same time rolls the printing roller 2 to perform printing. It is something to do.

First, the rolling transfer mechanism of the print roller will be described. (See Figures 1 and 2)

The motor 3 rotates a large gear 7 about a main fixed shaft 8 via gears 4 and 5 and a worm 6.

A roller 9 is fixedly attached to a part of the lower surface of the large gear 7, and the roller 9 is engaged with a long hole 12 of a lever 11 which is pivotally attached to a support shaft 10 at a separated position and swings. .

A long hole 1 is formed at the opposite end of the lever 11.
3 is provided, and a roller 15 provided on the lower surface of the slide block 14 provided above is engaged with the elongated hole 13.

In FIG. 2, the rotation of the large gear 7 causes the lever 11 to swing in the direction of arrow χ by the rotation of the roller 9, so that the slide block 14 guides the guide bars 16 and 16 in the direction of arrow y. Move linearly in the direction.

A support fitting 17 is fixed to the upper surface of the slide block 14 via a cushioning member 41, and a pin 18 is rotatably attached to the support fitting 17 so that the print roller 2 can rotate.

As a result, the printing roller 2 sandwiches the paper a or the like between the printing roller 2 and the printing wheel 1, and linearly moves in the direction of the arrow y while rotating.

Next, the operation mechanism of the type wheel will be described (see FIGS. 3, 4 and 5).

The upper cam 1 is provided on the upper side of the main fixed shaft 8 of the large gear 7.
9 and a lower cam 20 are provided, and a slide plate 21 is installed on the upper end portion of the main fixed shaft 8 between the main fixed shaft 8 and the support shaft 10.
The upper cam 19 contacts the roller 22 provided on the lower surface of one end of the slide plate 21, and the lower cam 20 contacts the roller 23 installed on the opposite side of the roller 22.

In FIG. 3, the upper cam 19 has a cam height surface which presses the roller 22 to cause the slide plate 2 to move.
The lower cam 20 that moves 1 to the left and contacts the roller 23 at this time is in contact with the lower part of the cam surface, so that there is no hindrance to the left movement of the slide plate 21.

With the rotation of the large gear 7, the upper cam 19
The lower cam 20 also rotates, and the lower cam surfaces 20 'and 20''press the roller 23 to move the slide plate 21 to the right.
At this time, the upper cam 19 in contact with the roller 22 has the upper cam surface 1
It pushes against 9 ', 19''and moves to the lower part of the cam, and does not hinder the rightward movement of the slide plate 21.

FIG. 1 is a state diagram in which the slide plate 21 is shifted to the left side, and FIG. 4 is a state diagram in which it is shifted to the right side.

A groove hole 26 is provided at the right end of the slide plate 21, and a pivot shaft 30 of a swing plate 29, 29 that rotates about a lower shaft 28 provided at the front end of the bracket 27 is provided in the groove hole 26. insert.

A long groove 31 is provided at the upper end of the swing plate 29, and an upper shaft 35 provided at one end of a lever 34 having a shaft 33 provided at the upper end of a fixed bracket 32 as a fulcrum is inserted into the long groove 31. To do.

When the slide plate 21 is moved to the right, the swing plate 29 is rotated clockwise about the lower shaft 28, and the lever 34 is rotated counterclockwise about the shaft 33.

The other end of the lever 34 is pivotally attached to one end of an arm 37 by a shaft 36, and the other end of the arm 37 is pivotally attached to a type wheel arm 38 by a shaft 39.

The type wheel arm 38 swings through a support shaft 40 at the base end thereof.

In FIG. 1, when the high surface of the upper cam 19 pushes the roller 22 to move the slide plate 21 to the left, the swing plate 29 rotates counterclockwise about the lower shaft 28. When the swing plate 29 rotates counterclockwise, the lever 34 rotates clockwise about the shaft 33. The rotation of the shaft 36 in the clockwise direction causes the type wheel arm 3 to move.
The shaft 39 of 8 is pulled up by the arm 37,
The type wheel arm 38 moves up around 0.

In FIG. 4, when the lower cam 20 presses the roller 23 to move the slide plate 21 to the right,
The swing plate 29 rotates clockwise around the lower shaft 28. At this time, the lever 34 rotates counterclockwise around the shaft 33 to move the shaft 36 to the position shown in FIG. 4 from FIG. By depressing the shaft 39, the type wheel arm 38 is lowered around the support shaft 40 and the type wheel 1 attached to the tip of the type wheel arm 38 is lowered until it comes into pressure contact with the printing roller 2.

A supplementary description will be given of the vertical movement of the type wheel arm 38. (See Figure 6)

State diagram A shows the state when the type wheel arm 38 is raised by θ °, and state diagram B shows the state when the type wheel arm 38 is descending.

Axis 3 whose position does not change in state diagram A
When the axis 36 moves in the direction of the arrow around the axis 3,
9 descends around the support shaft 40. That is, the type wheel arm 38 descends around the support shaft 40.

[0041]

Since the present invention has the above-mentioned structure,
The conventional printing device has a large inertia due to the volume of the printing wheel, and the rolling speed of the printing roller is too fast to keep up with the movement of the printing wheel up and down. Is wiped out.

That is, by reducing the inertia of the type wheel, the vertical movement of the type wheel can be made to follow the rolling speed of the printing roller, whereby the printing roller can reliably print the character surface of the type wheel. Will be able to.

The printing roller rolls and prints on paper or the like when the upward movement of the type wheel is blocked, but according to the present invention, the type wheel arm has a lever as shown in FIG. 6B. By connecting the arms in a straight line, it is possible to reliably prevent the printing wheel from being pushed upward by the printing roller.

[Brief description of the drawings]

FIG. 1 is an overall side sectional view

FIG. 2 is a plan view of a main part.

FIG. 3 is a plan view of a main part.

FIG. 4 is a side sectional view of the entire operation.

FIG. 5 is an overall plan view.

6 (A) and (B) are action diagrams showing action relationships.

[Explanation of symbols]

 1 type wheel 2 printing roller 7 large gear 8 main fixed shaft 9 roller 10 support shaft 11 lever 12 long hole 13 long hole 14 slide block 15 roller 16, 16 guide bar 17 support metal fitting 19 upper cam 20 lower cam 21 slide plate 22 roller 23 Roller 26 Groove Hole 27 Bracket 28, 28 Lower Shaft 29 Swing Plate 30, 30 Axis 31 Long Groove 34, 34 Lever 35, 35 Upper Shaft 36, 36 Shaft 37, 37 Arm 38 Type Wheel Arm 39 Shaft 40 Spindle

Claims (1)

(57) [Claims] 1. In a device for printing by moving a type wheel down by a switch and rollingly transferring an opposing print roller, a roller is provided on a part of a large gear provided on a main fixed shaft of a drive mechanism, and the roller is provided. It engages with a long hole of a lever that pivotally pivots on a support shaft located at a distant position, and is provided below a slide block provided at an upper part of a long hole provided at the opposite end of this lever. By engaging a roller and transmitting the rotation of the large gear to the roller, thereby horizontally swinging the lever, the slide block is linearly moved,
A print roller is rotatably installed on a support fitting provided on the upper surface of the slide block, an upper cam and a lower cam are provided on an upper side of a main fixed shaft of the large gear, and an upper end of the main fixed shaft and the support shaft are provided. A slide plate is installed between the roller and a roller provided on the lower surface of one end of the slide plate, and the lower cam contacts the roller provided on the opposite side of the roller, The upper cam and the lower cam rotate along with the rotation, the lower cam surface presses against the roller to move the slide plate, and rotates about the lower shaft of the bracket in the groove hole provided at one end of the slide plate. The swing plate is pivotally attached, and the upper shaft of one end of the lever having the shaft provided at the upper end of the fixed bracket as a fulcrum is inserted into the long groove provided at the upper end of the swing plate, and the swing plate is attached to the lower part. Rotate clockwise about the axis to Chromatography was rotated about the axis in a counterclockwise direction, and pivotally connected to one end of the arm and the other end of the lever shaft, and pivotally connected to character ring arm and the other end of the arm shaft,
A printing device configured to swing the type wheel arm via a support shaft at a base end thereof.