JPS5837652Y2 - printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a printer in which the position of a print point on a platen and the position of characters on a print head facing the print point can be adjusted in the vertical direction relative to each other.

For example, in a platen having a curved printing surface, such as a platen having a circular cross section, the printing surface of the type facing the printing surface is also formed into a curved surface having the same curvature as the printing surface.

Therefore, if the position of the print head is shifted upward or downward relative to the printing surface of the platen, the characters printed on the printing paper placed on the platen will appear clearly above, but the lower part will be affected by the printing pressure. It may become unclear due to lack, or vice versa, the lower part may appear clearly but the upper part may become unclear.

This idea was made in view of the above circumstances, and it is necessary to adjust the relative vertical direction between the printing point on the platen and the printing surface of the type that faces the printing point in an optimal manner. The purpose of this invention is to provide a printer with good print quality by adjusting the position of the printer.One embodiment of this invention will be described in detail below with reference to the drawings.

In the figure, reference numeral 1 denotes a platen having a circular cross section long in the left-right direction and arranged at the rear of the printer, on which printing paper 2 is wound.

Reference numerals 3 and 4 denote a pair of support shafts fixed to the printer parallel to the platen 1, and a platform-shaped support stand 5 is attached to the support shafts 3 and 4 along the support shafts 3 and 4. It is supported so that it can move in parallel.

A pair of upright protrusions 6 are formed at both front left and right ends of the support base 5, and a motor mounting bracket 8 can be rotated on each of the upright protrusions 6 via a short shaft 7, and can also be stopped at the original rotational position. It is supported as such.

A biasing spring 9 formed by bending a plate spring material is fixed to the center of the upper surface of the support base 5.

Further, another upright protrusion 10 is formed at the rear end of the support base 5, and the protrusion 10 has a horizontal protruding pin 11 facing forward.
is fixed.

The motor 12 is attached to the motor outer frame 13 in the motor mounting bracket 8.
has been fixed through.

A ratchet wheel 18 is fixed to one end of the rotor shaft 14 of the motor 12, and a print head 16 is detachably supported at the tip by a head fixing device 15.

The print head 16 has a center portion fixed to the rotor shaft 14 and has a number of spokes extending radially from the center portion, and a type body 17 is formed at the tip of each spoke.

The printing face 17a of this typeface is formed to have the same curvature as the printing face of the platen 1.

The motor 12, such as a pulse motor, rotates a rotor shaft 14 by a predetermined amount when a predetermined amount of pulse signal is input, and moves a desired type body 17 of a print head 16 supported on the rotor shaft 14 to a platen. This is to face the printing position No. 1.

The free end of the biasing spring 9 contacts the lower surface of the motor 12 when the motor 12 is in the first position shown by the solid line in FIG. 1, and urges the motor 12 toward the second position shown by the dashed line. are doing.

19 is an eccentric member, which has a through hole 20 as shown in FIG.
It has an eccentric body part 21 that is eccentric with respect to the main body, and an operating part 22 that is formed in a hexagonal shape.

This eccentric member 19 is fixed to the rear end surface of the motor outer frame 13 with a fixing screw 24 via a washer 23.

A three-armed latching lever 25 is rotatably supported on the eccentric body portion 21 .

The locking lever 25 constitutes a positioning means together with the eccentric member 19, the protruding pin 11, and a spring 29, which will be described later.

A first arm extending downwardly of the locking lever 25 is formed with a hook portion 26 that can engage with the protruding pin 11 .

The second arm extending leftward in FIG. 2 extends below the ratchet wheel 18, and has a pawl 27 that can be engaged with the ratchet wheel 18.

Further, the third arm extending upward has an operating portion 28 bent at its end.

A latch lever 2 is provided between the tip of the second arm and the motor outer frame 13.
A spring 29 is applied to bias the hook portion 26 of No. 5 in the direction of engaging the protruding pin 11.

In a printer having such a configuration, the print surface of the platen 1 and the print body 17 of the print head 16 facing the print surface
The adjustment method when the position is shifted upward will be explained below.

To move the motor 12 from the first position to the second position, rotate the latch lever 25 counterclockwise in FIG. 2 to release the engagement between the hook portion 26 and the protruding pin 11. The motor 12 floats toward the second position due to the biasing force of the biasing spring 9.

When the motor 12 is lifted against the resistance of the short shaft 7, it can be moved to the second position where printing by the print head 16 is disabled.

At this time, the latch lever 25 is biased by the spring 29 and the pawl 2
7 meshes with the ratchet wheel 18 on the rotor shaft 14, and the rotor shaft 1
4 is locked so that it does not rotate.

After removing the print head 16 in this state, loosen the fixing screw 24 a little and rotate the eccentric member 19 via the operating section 22. can be adjusted by moving vertically with respect to the motor outer frame 13.

When the position of the latch lever 25 is lowered with respect to the motor outer frame 13, the position of the type body relative to the platen 1 can be raised, and when the position of the latch lever 25 is raised, the position of the type body 17 can be lowered.

After the latch lever 25 has been moved by the required amount in this manner, the fixing screw 24 is tightened and the print head 16 is attached to complete the adjustment operation.

When the print head 16 in the second position is moved toward the first position where printing is possible, the hook portion 26 of the latch lever 25 moves the latch lever 25 against the spring 29 by the cam action with the protruding pin 11. 2 in the counterclockwise direction, and the protruding pin 11 and the hook portion 26 are engaged with each other.

Since the latch lever 25 is always biased clockwise by the spring 29, the protruding pin 11 and the hook portion 26 are held so that they do not separate.

Further, since the motor 12 is always urged toward the second position by the urging spring 9, the protruding pin 11 and the hook portion 26 are held without any play in the vertical direction, and the type body 1 of the print head 16
7 is held at a position appropriately facing the printing point on the platen 1.

As described in detail above, in this embodiment, the motor 12 is always urged toward the second position, and the positioning means is provided at the latch lever 25 that resists the urging force and holds the motor 12 at the first position. Furthermore, since an adjustment mechanism is provided which can finely adjust the relative position of the motor 12 with respect to the support base 5 by means of an eccentric member 19, the printing surface 17 a of the printing body 17 of the print head 16 with respect to the printing point on the platen 1 is provided. The printers can be positioned facing each other in an optimal state, thereby providing a printer with good print quality.

As described above, the present invention can provide a printer with good print quality, and has great effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of this invention, FIG. 2 is a perspective view as seen from the rear, and FIG. 3 is a partially exploded perspective view. In the figure, 5 is a support base, 9 is a biasing spring, 11 is a protruding pin, 1
2 is a motor, 16 is a print head, 19 is an eccentric member, 25
is a latch lever, and 29 is a spring.

Claims (1)

[Claims for Utility Model Registration] Types are formed at the tips of numerous spokes extending radially from the center, and a print head and a print surface of a platen are removably fixed to a rotor shaft at the center. is rotatably supported between a first position in close proximity to the printable state and a second position separated from the printing surface and in a non-printable state, and the print head is rotated appropriately to select characters. A printer that has a motor and a support stand that rotatably supports the motor, and that performs a printing operation while the support stand and the platen move relative to each other along the printing surface of the platen, the motor and the The motor is installed between the support stand and the first motor.
a biasing member that biases the motor from a position toward a second position; and a biasing member that is provided between the motor and the support base and positions the motor in the first position against the biasing force of the biasing member. A printer comprising: a positioning means for adjusting the position of the motor; and an adjusting mechanism formed of an eccentric member and provided on the positioning means so as to finely adjust the first position of the motor.