JPH03146381A - Recorder - Google Patents

Abstract

PURPOSE:To reduce a noise generated by reciprocating transfer of a carriage at a low cost by a method wherein a specified position of a driving force transmitting component disposed in tension between a drive pulley and a driven pulley is so constituted as to be elastically supported. CONSTITUTION:More tension than that in standing still of a carriage is generated between positions H-J-G to a belt 5 by inertia force of the carriage 1 when the carriage 1 is accelerated in its going path. Since a driven pulley 12 is energized a torsion coil spring 18 at that time, variation in tension is softened by absorption with the spring 18. Further, more tension than that in transfer at specified speed of the carriage is generated between positions H-I-G to the belt 5 by inertia force of the carriage even when it is decelerated in its coming path. Since a driven pulley 10 is energized with a torsion coil spring 17 at that time, variation in tension is softened by absorption with the spring 17. In the same way, variation in tension is softened by absorption with the spring 17 in acceleration of the going path and with the spring 18 in deceleration of the coming path. Said operation becomes smooth, and impact sound accompanied by reversing operation of its course is relaxed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a serial type recording device, and more specifically, to a device that reduces noise during recording by elastically supporting a belt or wire for transmitting driving force to a carriage. <Conventional technology> Today, so-called serial type recording devices, in which a recording head is mounted on a carriage and the carriage is moved back and forth to perform recording, serve as an output device for information input from a word processor, personal computer, etc. recording devices are widely used.

As shown in FIG. 6, the carriage movement structure of the serial type recording apparatus includes a driving pulley 51 connected to a motor 50 and a plurality of driven pulleys 52a and 52b.

A belt 53 is stretched between the belts 52c, and a carriage 54 on which a recording head is mounted is connected to the belt 53, and the carriage 54 is moved back and forth by rotating the motor 50 in forward and reverse directions.

Here, as the tensile structure of the belt 53, a predetermined driven pulley is made movable, and the timing belt 53 is
3 to a predetermined tension and then fixing the movable driven pulley with a screw or the like, or the so-called fixed tensilon method, in which an elastic member is connected to the movable driven pulley to constantly apply a predetermined tension to the timing belt 53. There is a so-called automatic tension method.

<Problems to be Solved by the Invention> In order to increase the recording speed in the apparatus, it is necessary to increase the reciprocating speed of the carriage 54.

However, in the above configuration, as the reciprocating speed of the carriage 54 is increased, the impact noise during each reversal operation becomes louder.

The cause of this is: (1) Bank lash between the drive pulley 51 and the belt 53 due to the reversal operation of the carriage 54 (deceleration on the outward journey, reversal, and acceleration on the return journey, or action of decelerating and reversing on the return journey, and acceleration on the outward journey); (2) Play with the shaft for sliding the carriage 54 or play during reversal in other sliding parts of the carriage.

Regarding the play between the carriage 54 and the shaft, it is often difficult to eliminate the play between the slide shaft and the slide shaft even if the precision of the molding die is improved. There is also a way to release it, but this would be costly.

Therefore, a method has been proposed in which the motor that moves the carriage 54 is optimally controlled to smooth the reversing operation of the carriage 54 and reduce the impact noise. When the engine 54 was operated at high speed, it was difficult to control it.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a recording apparatus that can reduce impact noise during carriage operation at a low cost.

<Means for Solving 1III> A typical means according to the present invention for solving the above-mentioned problem is that in a printing apparatus that performs printing by reciprocating a carriage on which a printing head is mounted, a carriage connected to a drive source is used. the driving pulley, a rotatable driven pulley, and a driving force transmitting member stretched between the driving pulley and the driven pulley and connected to the carriage; It is characterized in that at least one location in each of both sections with the carriage connection portion is elastically supported.

Effect> In the above means, since the elastic support absorbs the impact when the carriage accelerates/decelerates, the acceleration/deceleration and reversal operations of the carriage are performed smoothly, and impact noise is alleviated.

<Embodiment> Next, an embodiment in which the above means is applied to an inkjet recording apparatus will be described.

[First embodiment]

FIG. 1 is a perspective view of the recording apparatus, and FIG. 2 is a schematic plan view of the main parts.

(Overall Configuration) First, to explain the entire recording apparatus, the recording means 2 is mounted on a carriage l that is movable in the arrow a and arrow directions in FIG. Ink is ejected onto the recording sheet 3 to perform recording, and when the negative line recording is completed, the recording sheet 3 is conveyed by one line in the direction of the arrow in FIG. 1 by the sheet conveyance means 4.

Further, an annular driving force transmitting member 5 is connected to the carriage l, and this driving force transmitting member 5 is elastically supported at a predetermined position.

Next, the configuration of each of the above sections will be specifically explained.

(Carriage) The carriage l is movably mounted relative to the main body 6 of the apparatus. That is, a guide shaft 7 is attached to the device main body 6, and the carriage l is attached to this guide shaft 7.
The bottoms of the two are slidably engaged.

See you in 21st! As shown in I, a toothed drive pulley 9 and three toothed driven pulleys 10, 11, and 12 are mounted on a chassis 8 fixed to the device main body 6, respectively.
The drive pulley shaft 9a is connected to a carriage motor 13.

In addition, the driving pulley 9 and the driven pulley 10.11°12
2, a ring-shaped toothed belt 5 serving as a driving force transmitting member is extended over the frame so as to be elastically supported by elastic support means as described later, and the carriage l is mounted on this belt 5 as shown in FIG. They are connected at point G.

Therefore, when the carriage motor 13 repeats forward and reverse driving, the driving force is transmitted through the belt 5, and the carriage l reciprocates in the directions of arrows a and 2 along the guide shaft.

Incidentally, as shown in FIG. 1, a position sensor 19 is provided at the home position of the carriage l, and is configured to be able to detect whether or not the carriage l is at the home position.

Further, the moving position and moving speed of the carriage 1 are detected by an encoder provided at the bottom of the carriage 1. In this encoder, an encoder t7N14b having slits 14a at a predetermined pitch is attached to the apparatus main body 6, and a detection element consisting of a light emitting element and a light receiving element (not shown) is attached to the lower part of the carriage 1 so as to sandwich this encoder plate L4b. . Therefore,
When the carriage 1 moves, the light receiving element hits the slit 4a.
The moving position and moving speed of the carriage 1 are detected based on the number and period of pulses of light received through the carriage.

(Recording Means) Next, the recording means 2 uses an inkjet method in this embodiment, and has a recording head 2b formed by arranging a plurality of ink ejection ports (orifices) not shown in the front part of an ink cartridge 2a containing ink. is attached, and when the recording head 2b is driven according to the image signal, the cartridge 2
The ink in a is ejected from the ejection port, and the back side is placed on the platen 15.
The ink image is recorded on the recording sheet 3 supported by the recording sheet 3.

The ink cartridge 2a is mounted on the carriage 1 and fixed by a holding lever 16.

(Sheet Conveying Means) At the front of the recording means 2, there are provided a conveyance roller 4b rotated by a conveyance motor 4a, and a pinch roller (not shown) that is in pressure contact with the conveyance roller 4b and rotates as a result of the conveyance roller 4b.
A guide plate 4c is arranged around a.

As a result, the recording sheet 3 inserted between the conveyance roller 4a and the pinch roller 4b is guided by the guide plate 4C when the conveyance roller 4a rotates, and the recording sheet 3 is inserted between the recording head 2b and the platen 15.
1, and is conveyed in the direction of arrow C shown in FIG.

(Elastic support structure of belt) Next, the elastic support structure of the belt 5 will be explained.
As shown in FIG. 2, the driven pulley lO located in the belt position 111fG section where the drive pulley 9 and the carriage l are attached has a shaft 10a locked in an elongated hole 8a formed in the chassis 8. It is attached so that it can slide within the hole 8a. Further, a torsion coil spring 17 is attached to a fixed protrusion 8b protruding from the chassis 8.
One end of the pulley 7 is locked to a locking portion 8c of the chassis 8, and the other end is locked to the pulley shaft 10a.

As a result, the pulley shaft 10a moves in the direction of arrow d in FIG.
The belt 5 is elastically supported at position 11fl of driven pulley 10, which is within the interval between position H of drive pulley 9 and position 11G where carriage l is fixed. It will be done.

The same applies to the pulley 12, and the pulley shaft 12a
is slidably locked in the elongated hole 8d of the chassis 8, the shaft 12a is attached to the fixed protrusion 8e, and the screw thread has one end locked in the locking part 8f and the other end locked in the shaft 12a. The belt 5 is elastically supported by the coil spring 18 in the direction of arrow e in FIG. 2 (the direction in which tension is applied to the belt).

(Description of Operation) Next, the operation when recording is performed by the recording apparatus having the above configuration will be described.

During recording, the carriage motor 13 is driven to rotate forward and backward to move the carriage 1 back and forth in the directions of arrows a and 2 in FIG. The image is recorded by spraying the liquid onto the recording sheet 3.

Further, the conveyance motor 4a is driven in synchronization with the reciprocating movement of the carriage 1 to convey the recording sheet 3 line by line.

When the carriage 1 reciprocates, for example, if the movement in the direction of arrow a in FIG.
As soon as recording starts, ■ Outbound acceleration, ■ Outbound constant speed, ■ Outbound deceleration, ■ Reversal, ■ Return acceleration, ■ Return constant speed, ■ Return m reduction, ■
Reverse and repeat the operations of ■-〇.

In the above operation ■ During forward acceleration, key → ridge l
Due to the inertia force, the belt 5 has a tension greater than that when the carriage is stationary between )-J-0 in FIG. 2. At this time, since the driven pulley 12 is biased by the torsion coil bar 18, the tension change 1 is absorbed and relaxed by the spring 18.

Also, even during deceleration, the U force of the carriage 7 generates a tension in the belt 5 between H-1 and H-0 in FIG. 2 that is greater than when the carriage is moving at a constant speed. When S, the driven pulley lO is biased by the torsion coil spring 17, so the change in tension is absorbed and alleviated by the front Bi tensioner I7.

Similarly, when accelerating on the return trip, belt 5CH-1-
The tension between 0 and 0 increases, and when decelerating on the return trip, the
- The tension between J and 0 increases, but when accelerating on the return trip, spring 1
7, and during deceleration on the return trip, the tension change is absorbed and alleviated by the spring 18, respectively.

Therefore, even if the carriage l repeatedly accelerates and decelerates at high speed as it reciprocates, the movement is smooth and the impact noise caused by the reversing movement is alleviated. Further, since it is sufficient to elastically support the driven boobies IJI0 and IJI12 by the springs 17 and 18, the cost of the device can be reduced.

(Experimental Results) Here, the results of a noise experiment were conducted using the recording device having the above-mentioned configuration and when the toothed belt was not elastically supported as in the conventional case.

In the experiment, the moving distance of the carriage 1 was set to 57°, the reciprocating speed was set to 5 times/second, and the recording device
The noise was measured by placing the measuring device at the 0-simple position.

As a result, when the toothed belt is not supported elastically, 51d
B (A), whereas in the device of the above-mentioned example, it was 48 dB (^), making it clear that the noise was alleviated.

Note that dB(^) is the sound pressure level in A filter mode.

[Second example]

Next, a second embodiment in which the belt 5 is elastically supported will be described with reference to FIG. Incidentally, FIG. 3 is a conceptual diagram of the carriage drive system.

In this embodiment, a toothed drive boob 1120 connected to a carriage motor and three toothed driven pulleys 21 and 22 are used.
．． A toothed belt 5 is stretched between the belts 23 and 23.
A carriage (not shown) is connected to the G point position.

Further, the two driven pulleys 21 and 22 are each mounted movably in the direction of the arrow f in FIG.
1. A compression spring 24 is installed between the shafts 21a and 21b of 22.
is installed. Therefore, the belt 5 is urged to expand outward by the urging force of the spring 24.

In the above-mentioned carriage drive configuration, if movement in the direction of arrow a in FIG.
At this time, the driven pulley 21, which is biased by the spring 24, acts to alleviate the increase in tension. Furthermore, during deceleration on the return trip and acceleration on the outbound trip, the tension between H-J-0 of the belt 5 increases, and at this time, the tension between the spring 24
The driven pulley 22, which is biased by , acts to alleviate the increase in tension.

Therefore, even in this embodiment, the reciprocating movement of the carriage is performed smoothly, and the noise accompanying the reversing operation is alleviated. Furthermore, in this embodiment, since only one elastic member (compression spring 24) is required, the cost can be further reduced compared to the first embodiment.

[Third Example]

Next, a third embodiment will be explained using the conceptual diagram of FIG.

In this embodiment, a wire 28 whose cut portion is stretched and connected by a spring 27 is stretched between a driving pulley 25 connected to a carriage motor and one driven pulley 26. The spring 27 is installed at the position G where the carriage (not shown) is connected from the drive pulley 25.
Located within the point interval.

Further, a shaft 26a of the driven pulley 26 is attached so as to be movable in the direction of arrow g in FIG. 4, and a tension spring 29 is attached between the shaft 26a and a chassis (not shown).

In the carriage drive configuration, when the carriage moves outward in the direction of arrow a in FIG. However, at this time, the tension spring 27 acts to alleviate the increase in tension. Furthermore, during deceleration on the return trip and acceleration on the outbound trip, the tension between H-J-0 of the wire 28 increases, and at this time the tension spring 29 acts to alleviate the increase in tension.

Therefore, even in this embodiment, the reciprocating movement of the carriage can be performed smoothly, and the noise accompanying the reversing operation can be alleviated.

[Fourth embodiment]

Next, a fourth embodiment will be explained using the conceptual diagram of FIG.

In this embodiment, a toothed belt 5 is stretched between a toothed drive pulley 30 and a toothed driven pulley 31 which are connected to a carriage motor, and a carriage (not shown) is connected at a position G. Further, in this embodiment, a shaft 30a of the drive pulley 30 is mounted so as to be movable in the direction of the arrow in FIG. 5, and a tension spring 32 is mounted between the shaft 30 and a chassis (not shown).

In the carriage drive configuration, during the outward movement in the direction of arrow a in FIG. H-1 of belt 5 during return deceleration and outward acceleration
-0 tension increases.

In response to the change in tension, the tension spring 32 acts to alleviate the increase in tension, so that the carriage moves back and forth smoothly, and the noise associated with the reversing operation is alleviated.

In this embodiment, as in the second embodiment, only one elastic member (tension spring 32) is required, so that costs can be reduced.

In the first to fourth embodiments described above, the driving pulley and the driven pulley are not necessarily limited to toothed pulleys, and the same applies to the belt.

Further, the drive transmission member is not limited to the above-mentioned belt or wire, and may be, for example, a chain.

Further, in the embodiments described above, an inkjet type recording apparatus is illustrated, but the present invention can also be applied to other recording apparatuses such as a wire dot type recording apparatus.

<Effects of the Invention> As described above, the present invention provides an apparatus in which recording is performed by reciprocally moving a recording head, in which a drive pulley and a driven pulley are configured to elastically support predetermined positions of the driving force transmitting member stretched between them. , it is possible to reduce the noise generated by the reciprocating movement of the carriage at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an inkjet recording apparatus according to an embodiment of the present invention, FIG. 2 is a schematic plan view, FIG. 3 is an explanatory diagram of a second embodiment, and FIG. 4 is a third embodiment. FIG. 5 is an explanatory diagram of the fourth embodiment, and FIG. 6 is an explanatory diagram of the prior art. (2) is a carriage, 2 is a recording means, 2a is an ink cartridge, 2b is a recording head, 3 is a recording sheet, 4 is a sheet conveyance means, 4a is a conveyance motor 4b is a conveyance roller, 4c
is a guide plate, 5 is a belt, 6 is the main body of the device, 7 is a guide shaft, 8 is a chassis, 8a is a long hole, 8b is a fixing protrusion,
8c is a locking portion, 8d is a long hole, 8e is a fixed protrusion, 8r is a locking portion, 9 is a driving pulley, 9a is a pulley shaft, 10 is a driven pulley, 10a is a shaft, 11 is a driven pulley, lla is a shaft, 1
2 is a driven pulley, 12a is a shaft, 13 is a carriage motor, 14a is a slit, 14b is an encoder plate, 15 is a platen, 16 is a presser lever, 17.18 is a torsion coil spring, 19 is a position sensor, 20 is a drive pulley , 21.22.23 is a driven pulley, 21a, 22a are shafts, 24 is a compression spring, 25 is a driving pulley, 26 is a driven pulley, 26a is a shaft, 27 is a tension spring,
28 is a wire, 29 is a tension spring, 30 is a driving pulley, 30a is a shaft, 31 is a driven pulley, and 32 is a tension spring.

Claims (1)

[Claims] In a recording device that performs recording by reciprocating a carriage carrying a recording head, there is provided a drive pulley connected to a drive source, a rotatable driven pulley, and a drive pulley between the drive pulley and the driven pulley. The driving force transmitting member is stretched and connected to the carriage, and the driving force transmitting member is elastically supported at at least one location in each section of the drive pulley and the carriage connecting portion. recording device.