JPS6218279A - Printing apparatus - Google Patents

Abstract

PURPOSE:To dispense with a solenoid and to reduce the number of assembling processes, by transmitting the rotatory power of a motor to either one of a feed roller and the drive member of a printing head holder by operating the meshing of gears corresponding to the position of the head holder. CONSTITUTION:When a printing head 1 is present at a printing start position A, the press piece 22a of the operation member 22 integrated with a head holder 1 presses a first gear 11 against a spring 23 to allow the same to mesh with a second gear 17. When a motor 10 rotates, a feed roller 4 is revolved through the first and second gears 11, 17. When the head holder 2 moves from this position to the right, the meshing of the first gear 11 with the second gear 17 is released and the first gear 11 is meshed with a third gear 18 and a shaft 19 and a cam 20 are revolved to raise a head moving member 6 and a printing head is pressed to recording paper under predetermined pressure to stop the motor 10 and this state is kept as it is. The printing head is separated from recording paper by reversing the motor 10 at a printing finish position.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a serial type printing device that prints on recording paper using, for example, a thermal transfer method, and particularly relates to a holder drive mechanism that drives a head holder and a holder drive mechanism that drives the recording paper in a fixed direction. The present invention relates to a feed roller drive mechanism that drives the feed roller.

[Conventional technology]

In the conventional serial type printing device, as schematically shown in FIG. 4, a print head 1 is fixed to a head holder 2, and this head holder 2 is moved on a gearage shaft 3 to be fed by a feed roller 4. Printing is performed on the recording paper 5. While this printing is being performed, the holder drive member 6, which is engaged with the recess 2a of the head holder 2 on the side opposite to the side on which the print head 1 is attached, is attached to one end of the holder drive member. L-shaped link 7 with loose fit
By pulling the other end by the operation of the solenoid 8, it is directed in the direction of arrow A, and the print head 1 is pressed against the recording paper. A pressing spring 9 is interposed between the solenoid 8 and the L-shaped link 7, and the pressing force of the print head 1 is within a predetermined range.

When one desired line has been printed on the recording paper 5, the action of the solenoid is released and the head driving member 6 descends (moves in the direction opposite to arrow A), so that the print head leaves the recording paper. The recording paper 5 is advanced by a predetermined distance by rotating a pulse motor 10 dedicated to transporting the recording paper and rotating the feed roller 4 by a predetermined amount in a predetermined direction. On the other hand, the head holder 2 is moved along the gearage shaft 3 by a drive means (not shown) and stops at the next printing start position. Next, the solenoid 8 is activated to press the print head 1 against the recording paper with a predetermined force and move the head holder 2, thereby printing the next line.

[Problem that the invention seeks to solve]

The conventional printing device mentioned above is equipped with a pulse motor dedicated to driving the feed roller and a solenoid to press the print head against the recording paper, so it has a large number of parts, requires a large number of assembly steps, and is expensive. There was a problem with becoming.

[Means for solving problems]

This invention was made with the aim of solving the above problems, and includes a head holder that holds a print head and moves in a fixed direction from a printing start position, a feed roller that feeds recording paper in a fixed direction, and A holder driving member that drives the holder to move the print head toward the recording paper, a first gear that is rotated by a motor, a second gear that meshes with the first gear and drives the feed roller, and the first gear. a third gear that engages with the holder drive member and drives the holder drive member;
This printing device includes an operating member that controls the gear to mesh with the second gear or the first gear to mesh with the third gear, and the operating member controls the printing start position and other positions of the head holder. Accordingly, the meshing between the first gear, the second gear, and the third gear is switched. Further, in another aspect of the invention, the operating member is linked to the head holder to enable automatic switching.

[Effect]

When the operating member engages the first gear with the second gear when the head holder is at the printing start position, the rotational force of the motor is transmitted to the feed roller to feed the paper, and the head holder moves to the printing position. When the operating member switches the first gear to the third
When the gear is engaged, the rotational force of the motor is transmitted to the holder driving member, and the head is pressed in the direction of the recording paper.

In another invention, the operating member switches the clutch member in conjunction with the head holder.

〔Example〕

Embodiments of the invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 (al.
is a schematic plan view when the feed roller is being driven in the embodiment shown in FIG. 1, and FIG. 2(b) is a schematic plan view when the holder driving member is being driven. In these figures, the first
The same reference numerals are used for the same parts as in the figure. 11 is motor 1
0, the gears 12° 13 are rotated via the main shaft 16 parallel to the shaft 15 of the feed roller 4, and the bevel gears 11a, 11
The first gear 17, which has a shape in which gears b are combined back to back, is fixed to an extension of the shaft 15 of the feed roller 4 with the side having the bevel gear 17a facing the feed roller 4, and meshes with the bevel gear 11a. A matching second gear 18 is attached to a driven shaft 19 parallel to the main shaft 16 of the first gear 11, and a third gear 20 has a bevel gear 18a that meshes with the bevel gear 11b of the first gear 11. A peripheral cam plate 21 is fixed to the shaft 19, and a cam lever 21 is in contact with the peripheral edge of the peripheral cam plate 20, and is vibrated by the rotation of the peripheral cam plate 20 to move the holder drive member 6 up and down, and 22 is a cam lever from the head holder 22 side. A switching arm, ie, an operating member 23, which extends through the window 25b of the vertical wall 25a and has a pressing piece 22a at its tip in the direction of the first gear 11 and the second gear 17, is attached to the outer periphery of the main shaft 16 and A spring provided between the first gear 11 and the vertical wall 25 of the main body frame 24 constantly presses the first gear 11 toward the third gear 18. Then, the first gear 11. The clutch member is composed of a second gear 17° and a third gear 18.

Since the printing device of this embodiment has the above-described configuration, when the print head 1 is at the print start position A as shown in FIG. The gear 11 is pressed against the spring 23 to mesh the first gear 11 with the second gear 17. At this time, when the motor 10 rotates, the first gear 11 and the second gear 1
The feed roller 4 is rotated via the feed roller 7. When the head holder 2 moves from the printing start position to the right in the figure to perform printing, the first gear 11 moves to the right due to the elasticity of the spring 23, as shown in FIG. 11 and the second gear are disengaged, and at the same time, the first gear 1 engages with the third gear 18, the shaft 19 rotates, the cam 20 rotates, and the head moving member 6 is raised. and press the print head against the recording paper. When the print head presses against the recording paper with a predetermined force, the motor 10 stops, and the head moving member 6 is maintained in this state. By moving the print head to the right from the printing start position, printing is performed, and after moving to a predetermined print end position on the recording paper 5, the print head is separated from the recording paper by the reverse rotation of the motor 10, and then ,
It is moved to the left in the figure and stopped at the printing start position, resulting in the state shown in Figure 2 (al).

Next, another embodiment of the present invention shown in FIGS. 3(a) and 3(b) will be described.

In the embodiment, the operating member 22 comes into contact with the first gear 11 and moves the first gear to the right or left in cooperation with the spring attached to the main shaft 16 of the first gear, thereby moving the second gear 17 or the second gear 17. However, in this embodiment, the second operating member 32 is engaged with the second gear 17 and the third gear with the first operating member 22a.
A spring 33 that contacts the gear 18 at the same time and is attached to the shaft 15 of the feed roller of the second gear 17, and the third gear 18
The first gear 11 and the second gear 17 are pressed against the spring 34 attached to the shaft 19 of the
It is configured to mesh with. and head holder 2
As the operation member 32 moves to the right from the printing start position A, the operating member 32 also moves to the right under the tension of the springs 33 and 34, and as shown in FIG.
The first gear 11 and the third gear 18 are in mesh with each other, and the print head 1 is connected to the recording paper 5 in the same way as in the previous embodiment.
can be imposed on. Thereafter, printing is performed and the operation is the same as in the previous embodiment. According to this embodiment, by using a pulse motor as the motor, the pressing force of the head 1 can be adjusted by i, which is effective for printing on the record 7 with low smoothness.

The effect of evening light As explained above, according to the present invention, the first gear.

The second and third gears transmit the rotational force of the motor to either the feed roller or the drive member of the print head holder, eliminating the need for conventional solenoids, eliminating parts that require wiring, and reducing assembly steps. This results in a reduction in costs, thereby contributing to cost reduction. Also,
According to another invention, the clutch member consisting of the first gear, the second gear, and the third gear is switched according to the position of the head holder, so that automatic switching is possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2(a)
is a schematic plan view when the feed roller is driven in the embodiment shown in FIG. 1, FIG. 2 is a schematic plan view when the holder driving member is driven, and FIG. A schematic plan view when the feed roller is driven in FIG. 3 (b
1 is a schematic plan view when the holder driving member is driven. %＋
to A<11 f, r(+Jq, <a, th s. ■...Print head, 2...Head holder, 3...
Carriage shaft, 4...Feed roller, 5...
- Recording paper, 6... Head moving member, 10... Motor, 11... First gear, 17... Second gear, 18...
・Third gear, 22°32...Operating member (arm). Figure 3 (a) ] O Kaya Figure 3 (b) Poetry

Claims (2)

[Claims] (1) A head holder that holds the print head and moves it in a fixed direction from the printing start position, a feed roller that feeds the recording paper in a fixed direction, and a holder that drives the head holder and moves the print head in the direction of the recording paper. A driving member, a first gear rotated by a motor, a second gear that meshes with the first gear and drives the feed roller, and a third gear that meshes with the first gear and drives the holder drive member. and an operating member that controls the clutch member so that the first gear meshes with the second gear or the first gear meshes with the third gear. . (2) A head holder that holds the print head and moves it in a fixed direction from the printing start position, a feed roller that feeds the recording paper in a fixed direction, and a holder that drives the head holder and moves the print head in the direction of the recording paper. a driving member; a first gear that is directly rotated by the motor; a second gear that meshes with the first gear and drives the feed roller; and a third gear that meshes with the first gear and drives the holder drive member. and an operating member that controls the clutch member to engage the first gear with the second gear or the first gear with the third gear, and the operating member includes: A printing device that operates in conjunction with the head holder to switch a clutch member depending on a printing start position and other positions of the head holder.