JPS62142670A - Printer - Google Patents

Abstract

PURPOSE:To enable the cost to be lowered, by providing a single drive source capable of being rotated both forward and reversely, and using the drive source as a common drive source. CONSTITUTION:When a drive source capable of being rotated both forward and reversely is operated to rotate a screw shaft 7 forward and reversely, a carriage 4 is reciprocated. In a forward stroke, a printing head 16 is pressed against a recording paper by a spring and performs printing according to a printing signal. When the carriage 4 is moved rightward, a pinion 21 engaged with a rack 20 is rotated, oscillatable gears 23, 24 engaged with the pinion 21 are rotated and an L form oscillating plate is oscillated clockwise, whereby the rotation of the gear 23 is transmitted to a take-up shaft 15 through a small gear 26 and a large gear 25, thereby taking up an ink ribbon. When the carriage 4 is moved leftward after it reaches the right end and printing in one line is finished, the pinion 21 engaged with the rack 20 is rotated, whereby the printing head 16 fitted to a turnable member 19 is separated from the recording paper.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of driving a carriage, feeding recording paper, winding up an ink ribbon, and pressing/releasing a head with a single drive source capable of forward and reverse rotation. The present invention relates to a printer that is configured as follows.

[Background of the invention]

In general, printers run a carriage perpendicular to the recording paper supported on a platen, and a head mounted on the carriage presses the ink ribbon onto the recording paper to print, but the carriage runs in the forward and reverse directions. This is done by a timing belt stretched between a driving wheel directly connected to the motor and a driven wheel installed opposite it, as well as crimping and bonding of the print head.
The release is done by a solenoid or motor built into the carriage, and then when the printing of the - line is finished, remove the recording paper! A dedicated motor or solenoid was also used to power the platen for pitch feeding.

Therefore, in the case of the above-mentioned printer, a dedicated drive source is used for each mechanism for carrying, moving the paper, feeding the recording paper, and pressing and releasing the head.

Not only was the wiring complicated, but the cost was also high.

In addition, during the printing operation described above, the power for winding up the ink ribbon equivalent to the amount of ink ribbon fed out from the original winding core onto the head surface onto the winding core is generated by the rotation meshing with the rack plate provided parallel to the carriage running path. This was done through a gear train consisting of multiple gears.

[Purpose of the invention]

This invention is intended to solve the above-mentioned problems, and enables each operation of carriage travel, recording paper feeding, ink ribbon winding, and head compression/release to be performed by a single common drive source. The purpose is to provide a printer that enables cost reduction.

[Structure of the invention]

In order to achieve the above object, the present invention is provided with one drive source capable of forward and reverse rotation, and the drive source is connected to a carriage traveling mechanism, a platen rotation mechanism 9, a take-up shaft rotation mechanism, and a head crimping/releasing mechanism. It is configured as a common driving source for the mechanism.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

In the figure, 1 is a platen, and 2 is a recording paper supported on the surface of the platen 1 by a presser roller 3.

4 is a carriage. The carriage 4 can be reciprocated by forward and reverse rotation of a screw shaft 7 which is connected via a timing belt 6 to a drive source 5 which is capable of forward and reverse rotation.

The drive shaft 8 of the platen 1 is connected via an intermediate gear 11 to a gear 10 connected to the end of the screw shaft 7 via a clutch 9. This clutch 9 is connected only for the necessary time when the screw shaft 7 rotates in one direction and moves the carriage 4 in the direction (to the left) to return to the home position, transmits the rotation of the screw shaft 7 to the platen 1, and records the rotation. Paper 2 can be fed by one pitch in the direction of the arrow. 12 is an ink ribbon cassette detachably attached to the upper surface of the carriage 4;
An ink ribbon a whose both ends are wound around a source core 13 and a take-up core 14 is housed inside. 15 is carriage 4
A take-up shaft 16 engaged with a take-up core 12 protruding from the upper surface of the
is the print head. The print head 16 can rotate around a shaft 17 as shown in FIGS.
It is attached to a rotating member 19 provided with. This rotating member 19 is biased by a spring in the direction of pressing the head 16 onto the platen 1.

Reference numeral 20 denotes a rack provided parallel to the travel path of the carriage 4, and the rack 20 also serves as a guide for the rear end of the carriage 4. Reference numeral 21 denotes a pinion meshed with the rack 20. A bent portion of an L-shaped swing plate 22 is loosely fitted into the central axis 21' of the pinion 21, and the pinion is fitted into both ends of the L-shaped swing plate 22, respectively. Swing gear 23.2 so as to mesh with 21
4 is pivoted. This L-shaped rocking plate 22 is the rack 20
The swing gear 23 is rotated in the rotational direction of the pinion 21 that is engaged with the
．． 24 follows, so that when the carriage 4 moves to the right, it swings clockwise, and when it moves to the left, it swings counterclockwise. 25 is a fixed main gear of the winding shaft 15, 26 is a child gear meshed with the main gear 25, and the core gear 26 has one end of which the swing plate 22 swings clockwise. A swing gear 23 which is pivotally supported is engaged with the swing gear 23 (see Fig. 3), 27 is a first gear which is engaged with a gear 18 of a rotating member 19 to which the head 16 is attached, and 28 is a first gear. A second gear 27 meshes with the second gear, and a third gear 29 meshes with the second gear 28. When the third gear 29 swings in the counterclockwise direction, a swing gear 24 pivotally supported at its end meshes with the third gear 29 (see FIG. 4). ), the third gear 29 has two gears 291 on the same shaft 30 as shown in FIG.
292 is loosely fitted through a felt 293 and pressed against it by a spring 294. However.

One gear 291 is connected to the second gear 28, and the other gear 291 is connected to the second gear 28.
92 is adapted to mesh with the swing gear 24. This allows the head 16 to be released from the platen 1 so that the felt 293 can absorb the load when the head 16 is stopped.

In the above embodiment, the drive source 5 capable of forward and reverse rotation is operated,
When the screw shaft 7 is rotated forward and backward by the power, the carriage 4 reciprocates. In the past (rightward movement), the print head 16 is pressed against the recording paper 2 by the action of a spring, and prints according to the print signal. When the carriage 4 moves to the right, the pinion 21 engaged with the rack 20 rotates in the direction of the arrow as shown in FIG. The mold swing plate 22 swings clockwise, and the swing gear 23 moves to the child gear 26. It is transmitted to the winding shaft 15 via the parent gear 25, and winds up the ink ribbon a.

In this way, when the carriage 4 reaches the right end and finishes printing the - line, and the carriage 4 moves to the left, the pinion 21 meshed with the rack 20 rotates in the direction of the arrow as shown in FIG. The engaged swing gears 23 and 24 rotate in the direction of the arrow, and the L-shaped vibration swing plate 22 swings counterclockwise, and the swing gear 24 meshes with the third gear 29, causing its rotation. are the second and first gears, and the rotating member 19
Because it rotates like an arrow.

The print head 16 attached to the rotating member 19 separates (releases) from the recording paper 2. When the print head 16 stops in the most separated state, the load is applied to the third gear 29 as described above.
It is absorbed by.

Further, when the carriage 4 moves to the left, the clutch 9 provided at the end of the screw shaft 7 is connected, and the rotation of the screw shaft 7 is transmitted to the platen 1.

When the carriage 4 returns to the home position, the recording paper 2 is advanced by one pitch, and printing of the second line is executed on the right line of the ninth carriage 4.

〔Effect of the invention〕

As described above, the present invention includes one drive source capable of forward and reverse rotation, and uses this drive source as a common drive for the carriage traveling mechanism, the platen rotation mechanism 9, the take-up shaft rotation mechanism, and the head crimping/release mechanism. Because it is configured as a single drive source, a single common drive source can perform the following operations: traveling the carrier, feeding the recording paper, winding the ink ribbon, and pressing/releasing the head, reducing costs. In addition, it provides various excellent effects such as facilitating the setting and adjustment of the timing of each operation.

[Brief explanation of drawings]

The figures show an embodiment of the invention, and Figure 1 is a plan view;
FIG. 2 is an enlarged plan view of the main part, FIG. 3 is an operational view during winding, FIG. 4 is an operational view when the head is released, and FIG. 5 is a side view showing the configuration of the third gear. 1 - Platen 2 - Recording paper 4 - Carriage 5 - Print head 6 - Drive source 7 capable of forward and reverse rotation - Screw shaft 8 - Timing belt 9 - Clutch 10 - Platen drive shaft 15' - m--Rewinding shaft 16--Print head 19--Rotating member 20--Rack 21--Pinion 22--L-shaped swinging plate 23, 24--Swinging gear

Claims (2)

[Claims] (1) A drive source capable of forward and reverse rotation is provided, and the drive source is configured as a common drive source for a carriage traveling mechanism, a platen rotation mechanism, a take-up shaft rotation mechanism, and a head crimping/releasing mechanism. A printer characterized by: (2) A screw shaft for reciprocating the carriage is connected to the drive source, a platen drive shaft is connected to the screw shaft via a clutch, and the screw shaft is engaged with a rack provided along the carriage travel path. 2. The printer according to claim 1, wherein the take-up shaft and head crimping/releasing gear are connected to the pinion via a swing gear.