JPH0239971A - Recorder - Google Patents

Abstract

PURPOSE:To simplify a feeding mechanism for a recording material and enable highly accurate feeding of the recording medium with an inexpensive construction by providing a gear at an inner surface of one end of a platen, and engaging the gear directly with a gear provided in direct coupling with a driving shaft of a motor. CONSTITUTION:A gear 70a is provided in the form of an internal gear at one end surface of a platen 70, and an LF motor 90 is turnably mounted on a support column 92 through a motor stay 91. A motor gear 93 is tightly press fitted to a driving shaft of the motor 90 so that it is engaged with the internal gear 70a. A tension spring 94 has a fixed end attached to a spring hook part 1b, the other end being fitted to the motor stay 91, and acts in the direction for energizing the motor gear 93 toward the gear 70a. In this construction, the platen 70 is rotated in a direction B through the internal gear 70a engaged with the motor gear 93, following up to a rotating direction A of the motor 90, whereby a recording material wrapped round the outer periphery of the platen 70 is fed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording apparatus, and more particularly to a recording apparatus that can improve the feeding accuracy of a recording medium in an inkjet recording system.

[Prior Art] Conventionally, various inkjet recording systems have been proposed and attempts have been made to put them into practical use, depending on their principles, configurations, etc. Among these, the so-called on-demand method, in which ink droplets are timely ejected during recording to obtain a desired recorded image, is becoming mainstream among inkjet recording methods because it is suitable for downsizing and simplifying the apparatus. Furthermore, as a trend in recent years, the rise of color inkjet recording devices that realize recording of color images by combining the use of multiple nozzles and the use of color ink has become remarkable.

Under these circumstances, various proposals have been made regarding color inkjet recording apparatuses in which the size of the recording medium is increased.

FIG. 4 is a perspective view showing, as an example, the main mechanism of a conventional inkjet recording apparatus.

The frame structure of the recording apparatus is composed of a base frame 1, a left side plate 2, and a right side plate 3.

The carriage mechanism section includes a recording head 50 and a recording head 50.
, a main shaft 30, an OR motor 31 for driving the carriage 20, and a drive belt 3.
2. FPC for supplying recording signals to the recording head 50
33, a driving pulley 34, a driven pulley 35, and other parts.

The recording head 50 is attached to the carriage 20 and is movable between the left side plate 2 and the right side plate 3 as the carriage 20 moves. The carriage 20 is connected to the main shirt via an integrally constructed bearing with high sliding properties.
A sliding movement is made on 30.

The power source at this time is the OR motor 31, and the CR motor 31 drives the carriage through a drive pulley 34 press-fitted onto the shaft thereof and a toothed drive belt 32 that engages with the drive boo IJ34. 20. The driven pulley 35 is provided at a position facing the drive pulley 34, and applies appropriate tension to the drive belt 32 by a belt tension biasing means 36.

Next, the recording medium feeding mechanism unit moves the rolled recording medium 8
0, platen 70, recording medium presser 71, LF motor 8
0, LF power transmission system 81 and other parts.

The platen 70 has a cylindrical pipe shape made of aluminum or the like, and is supported by two rings 73a on each end provided on the base frame 1 and adjustment means such as springs. This is achieved by holding the outer diameter of the ring 73b, one at each end, which presses the ring 73b against the base frame. The power transmission mechanism transmits the power of an LF motor 80 such as a stepping motor to L.
The torque is increased through the deceleration mechanism of the F power transmission system 81, the feed step is subdivided, and then transmitted to the LF drive pulley (not shown). After this, the LF
Power is transmitted to a plurality of LF belts (toothed) 74 that engage with the drive pulley, and the LF belt 74 is connected to the platen 70.
The recording medium 60 is fed by a predetermined amount by being driven while being accommodated in a groove provided on the outer periphery of the recording medium 60 . The recording medium presser 71 is formed of a thin steel plate such as stainless steel, and is held between the right side plate 3 and the LF side plate 4 by a holding member 72, and holds the recording medium 60a against the platen 70 by a biasing means (not shown). The recording medium Boa is biased in the direction of pressing against the recording medium Boa, and plays the role of suppressing floating of the recording medium Boa near the recording position. In the figure, reference numeral 75 denotes a rotating roller contacting member installed on an extension of the recording medium presser 71. The rotating roller contacting member 75 is made of a highly rigid steel material, and is connected to the left side plate 2 and the LF side plate 4. is held fixed. 100 is a recovery mechanism for the recording head 50 provided outside the print area, and by operating the recovery mechanism 100 as necessary, cleaning the nozzle surface of the recording head 50, supplying ink, recovering from non-discharge, and preventing nozzle drying. etc. will be done.

When attempting to obtain desired characters and images using the recording apparatus having the above configuration, an FPC is installed in the recording head 50.
33, transmits the recording signal, and at the same time outputs the OR motor 31
is driven to cause the carriage 20 to reciprocate. At this time, by feeding the recording medium Boa at a predetermined pitch in synchronization with the reciprocating movement of the carriage, characters, images, etc. are formed on the recording medium as a collection of dots.

[Problems to be Solved by the Invention] The following problems have been pointed out in the configuration of the conventional recording apparatus described above.

In order to improve the feeding accuracy of the recording medium, it is essential to transmit the entire driving force from the power source to the recording medium without loss through intermediate transmission systems such as gears and belt pulleys. . However, in reality, there are always errors in gear meshing and the effects of backlash between pulleys and belts, so in order to ensure high recording medium feeding accuracy, it is necessary to improve component accuracy and assembly accuracy. Improvement is required, and without such efforts, the above-mentioned high-precision recording medium feeding will not be possible. Therefore, in order to ensure high precision, conventional recording medium feeding mechanisms have to have a complicated component structure, and also require strict management of individual components and numerous checks in assembly management. However, when looking at the device as a whole, an increase in cost due to an increase in the number of parts is unavoidable, and the assembly management process becomes complicated, making it difficult to improve productivity.

In order to solve these conventional problems, it is an object of the present invention to simplify the recording medium feeding mechanism and realize highly accurate recording medium feeding with an inexpensive configuration.

[Means for Solving the Problems] The present invention has been made to achieve the above-mentioned object, and includes a recording head whose drive is controlled based on a recording signal, a carriage on which the recording head is mounted, and a recording target. The recording medium includes a platen for supporting a medium, a recording medium transport mechanism for transporting the recording medium, and a carriage control mechanism for reciprocating the carriage in a direction orthogonal to the transport direction of the recording medium. The recording apparatus is characterized in that a gear is provided on the inner surface of one end of the platen, and the gear provided directly connected to the drive shaft of the motor is directly engaged with the gear on the inner surface of the platen.

[Action Co. The measures described above operate as follows.

The platen, which is a cylindrical pipe rod around which the recording medium is wound, has an internal gear formed at one end thereof, and is configured to transmit motor power through a motor gear that directly engages with the internal gear. Therefore, the only component of the power transmission system is the meshing of two gears, and highly accurate feeding of the recording medium can be realized very easily.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram schematically showing a recording medium feeding mechanism of a recording apparatus according to the present invention. In the figure, 70 is a platen that rotates around the outer periphery of which a recording medium (not shown) is wound.
are formed in the shape of internal teeth. The LF motor 90 is rotatably mounted via a motor stay 91 around a support 92 installed on a side plate (not shown). The motor gear 93 is tightly press-fitted into the drive shaft of the motor 90 and is connected to the internal gear 70a formed on the platen 70.
attached to engage with. tension spring 9
4, a spring hook whose fixed end is cut and raised from the pace frame is fixed to part 1b, and the other end is attached to the motor stay 91, and the spring hook has a direction in which the motor gear 93 is urged against the gear 70a of the platen 70. It is acting on

FIG. 2 is a side view showing in more detail the structure of the recording medium feeding mechanism of the recording apparatus according to the present invention. Components in the figure that are the same as those in FIG. 1 are designated by the same reference numerals.

The platen 70 has three small rollers 95 at its outer periphery.
Guided by 95 b195 c, LF motor 90
The inner t follows the rotational direction A of and engages with the motor gear 93.
The platen 70 rotates in the B direction via the RtFJ vehicle 70a.
A recording medium (not shown) wrapped around the outer periphery of the recording medium is conveyed.

FIG. 3 is a detailed diagram showing the meshing state of gears in the recording medium mechanism according to the present invention. In the figure, the motor gear 93 is attached to the shaft 90a of the LF motor 90 by press fitting, and its shape is divided into a gear part 93a and a non-gear cylindrical part 9.
It consists of 3b.

On the other hand, the platen 70 also has an internal gear part 70a and an internal opening part 70b.
As explained in FIG. 2, the motor gear 93 is urged in the direction of arrow C by the tension spring.
It is pressed so as to mesh with internal teeth i1f 70a formed on the platen 70, and its stopping position is determined at the position where the non-gear cylindrical portion 93b and the inner opening portion 70b come into contact. At this time, the meshing of the gears is as shown in FIG.
3d engages with the tip circle 70c and tooth bottom circle 70d of the internal gear 70a formed on the platen 70 while maintaining a predetermined gap, that is, appropriate backlash.

[Effects of the Invention] As explained above, according to the present invention, the feeding mechanism for the recording medium is constructed by directly meshing the motor gear and the platen gear. It is possible to reduce the number of points, facilitate assembly, and reduce errors and losses between parts constituting the transmission system, so it is possible to improve the feeding accuracy of the recording medium with a small configuration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a recording medium feeding mechanism of a recording apparatus according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an explanatory view showing the meshing state of gears. FIG. 4 is a perspective view of the main mechanical parts of a conventional recording apparatus. 20 Carriage 5011 Recording head 60 Recording medium 70 Platen 70a Internal gear 80.90 LF motor 93 Motor gear

Claims (1)

[Claims] a recording head whose drive is controlled based on a recording signal; a carriage on which the recording head is mounted; a platen that supports a recording medium; a recording medium transport mechanism for transporting the recording medium; In the recording apparatus comprising a carriage control mechanism for reciprocating in a direction perpendicular to the direction in which the recording medium is transported, one of the platens
A recording device characterized in that a gear is provided on the inner surface of the end so that the gear provided directly connected to the drive shaft of the motor and the gear on the inner surface of the platen are directly engaged with each other.