JP2001124599A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder for suppressing the increase of noise level accompanying resin molding for miniature lightweight, low in the noise level, small in size and lightweight in weight. SOLUTION: A vibration control steel plate 25 as a vibration control member is assembled at both or one of the alarm terminal unit assembling position and the input terminal unit assembling position of the rear face of a case 22a housing a body unit provided with a record head drive motor being a noise source. In addition, the vibration control steel plate is integrally resin-molded on the side wall and the upper face of the case 22a as an insert vibration control steel plate 26 when the case 22a is resin-molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to measures for reducing the size and weight of a recorder and reducing noise.

[0002]

2. Description of the Related Art The configuration of a recorder according to the prior art will be described with reference to FIGS. FIG. 5 is a perspective view showing the appearance of the recorder 1 of the ink jet recording system. FIG. 6 is an exploded perspective view showing the configuration of the housing 2. The housing 2 includes a door 21, a case 22, an alarm terminal unit (an alarm terminal in FIG. 6) 23 which is an optional unit, and an input terminal unit (FIG. And input terminals 24). FIG. 7 is a perspective view showing the appearance of a recorder main unit (hereinafter abbreviated as the main unit) 3, and FIG. 8 is an exploded perspective view showing the configuration of the main unit 3.

Referring to FIG. 8, the structure of the main unit 3 and the operation of the recorder will be described. Inkjet recording head held by head drive belt 31 (recording head in FIG. 8)
32 is driven by a stepping motor 33 to move left and right and eject ink according to a command from a printed board 34, and records information such as an input from an input terminal on a chart paper 36. The left and right movement of the inkjet recording head 32 is due to the rotation of the stepping motor 33 being transmitted to the head drive belt 31 via the motor gear 37 and the belt drive gear 38. The chart paper 36 is fed from the chart case 35 by a paper feed motor 39. These parts are respectively attached to predetermined positions of the frame 40 and the like, and the main unit 3 is configured.

[0004]

In recent years, including the recorder having the above-described structure, there is a strong demand for instruments that are lighter and smaller in size such as a depth dimension for saving space. ing. For this reason, the case 22 of the housing 2 and the frame 40 of the main unit 3 and the like are tending to be formed from a conventional sheet metal structure into a full plastic mold that can cope with an internal structure having a complicated shape. With the resin molding, a problem has arisen that vibration of a drive motor such as the stepping motor 33 resonates with a resin-molded, compact and lightweight housing to increase the noise level.

As an example, in a conventional sheet metal structure, 55
The noise level, which was dB, was increased to 61 dB in the compact and lightweight structure that was molded with resin. By the way, the noise level measured only with the main unit without being stored in the housing is
It was 50 dB. An object of the present invention is to provide a recorder having a low noise level by suppressing a case in which a resin molded and small and lightweight housing is resonated with vibration of a driving motor to raise a noise level. is there.

[0006]

The above-mentioned increase in the noise level is caused by a situation in which the housing is easily resonated by the vibration of the drive motor due to resin molding of a case or a frame for reducing the size and weight. it is conceivable that. Therefore, means for reducing the noise level include: (1) First,
(2) Attenuate internal vibration to reduce external vibration, and (3) Make drive motor vibration difficult to transmit to the case and housing. , Can be raised.

As means (1) and (2), it is effective to attach a damping member such as a damping steel plate or a rubber plate to the housing. As means (3), a drive motor is used. It is effective to attach to the frame via a cushioning material such as a cushion spring that absorbs vibration. According to the present invention, there is provided a recorder for recording information on a recording medium by moving a pen, an ink jet recording head, or the like by driving a stepping motor, a servo motor, or the like of the main body unit. In a recorder in which a case accommodating the main unit is formed by at least a resin mold, a vibration damping member is incorporated in the case (the invention of claim 1).

By incorporating the vibration damping member, the resonance frequency of the housing deviates from the driving frequency of the motor, and the housing becomes difficult to resonate. Further, the internal vibration is attenuated by the vibration damping member. The noise level drops. Claim 1
In the invention of (2), a part or the whole of the vibration damping member is integrated with the case as an insert when the case is made (the invention of claim 2).

[0009] Since the damping member is integrated into the case as an insert, the work for incorporating the damping member into the case becomes unnecessary, and no space is required for the damping member. Variations in effects can be reduced. In the invention of claim 1 or claim 2, the damping member is a damping steel plate (invention of claim 3). The damping steel sheet is excellent in cost and performance as a practical damping member.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recorder according to the present invention will be described with reference to examples. It is to be noted that the same reference numerals are used for portions having the same functions as the conventional technology. FIG. 1 is an exploded perspective view showing the configuration of a casing of a second embodiment of a recorder according to the present invention. In the first embodiment, the insert damping steel plate 26 shown in FIG. The case in this case is referred to as a case 2b, and the case is referred to as a case 22b.

[First Embodiment] The first embodiment uses a housing 2b having a structure without the insert damping steel plate 26 in FIG. The housing 2b includes a door 21, a resin case 22b molded by using, for example, a noril resin, and a damping steel plate 25 screwed to the back surface of the case 22b. As shown in FIG. 6, the two damping steel plates 25 are interchangeably replaced with an alarm terminal unit and an input terminal unit which are optional units. The vibration damping steel plate 25 suppresses the vibration caused by the stepping motor 33 and the resonance vibration between the housing 2b.

FIG. 2 is a cross-sectional view showing the structure of the damping steel sheet 25. The two steel sheets 251 are integrated with a center rubber layer 252 interposed therebetween, and the rubber layer 252 serves as a cushioning material and one of the steel sheets 251 serves as a cushioning material. The vibration received by the steel sheet is attenuated and transmitted to the other steel sheet. For reference, the weight of the damping steel plate 25 is 100 g, and the weight of the alarm unit and the input terminal unit is 170 g.

Table 1 summarizes the noise levels related to this embodiment and the actual measured values of the noise level of the second embodiment.

[0014]

[Table 1] The measurement results in this table are summarized as follows. (1) By housing the main unit in the case 22b, the noise level is increased by 11dB. This is considered to be due to the fact that the vibration accompanying the driving of the main unit resonates with the case 22b, thereby greatly increasing the noise level. (2) The noise level increased by storing in the case 22b may be caused by installing the damping steel plate 25 on either or both of the alarm terminal unit installation position and the input terminal unit installation position on the back of the case 22b. By incorporating one or both of the alarm terminal unit and the input terminal unit into the system, the power consumption is reduced by about 7 dB, and both are almost the same level.

This noise level is almost the same as that of a recorder using a case or a frame made of a conventional sheet metal structure. The fact that the effect of reducing the noise level is almost the same in any case is that incorporating the damping steel plate 25, the alarm terminal unit, and the input terminal unit on the back of the case 22b reduces the increase in the noise level due to resonance to almost zero. It is presumed that the alarm terminal unit and the input terminal unit also suppress the resonance of the housing 2b, similarly to the damping steel plate 25. Therefore, when the alarm terminal unit or the input terminal unit is incorporated, it is not necessary to incorporate the damping steel plate 25, but when neither is incorporated, it is necessary to incorporate the damping steel plate 25 into at least one of them. is there.

The degree of reduction in size and weight of the recorder according to this embodiment is shown in comparison with the recorder according to the prior art, and the weight is reduced from 4.5 kg to 1.7 kg, and the depth is 285 mm. Reduced to 197mm. [Second Embodiment] FIG. 1 is an exploded perspective view showing the structure of a housing 2a according to a second embodiment.

In this embodiment, when the case 22a is molded, a damping steel plate is inserted as an insert into some of the upper, lower, left and right wall surfaces of the case 22a and integrally molded with resin. A damping steel plate integrally molded with resin is shown as an insert damping steel plate 26. In the case of FIG. 1, the insert damping steel plate 26 is inserted into the left and right side wall surfaces.

A part of the result of examining the effect of reducing the noise level by changing the position where the insert damping steel plate 26 is inserted is shown in Table 1 above. According to it, it is most effective to insert it on the upper surface and the noise level is 56
reduced to dB. The same is true for the case of inserting on both sides. Further, when any one of the damping steel plate 25, the alarm terminal unit and the input terminal unit is incorporated on the back of the case 22a, the noise level is reduced to 54 dB as in the first embodiment, and the level is reduced to the first embodiment. At the lowest level.

Among the upper, lower, left and right wall surfaces of the case 22a, the upper surface is most effective because the wall surface of the frame of the main unit does not exist on the upper surface side, so that the inner surface of the case 22a is directly exposed to the air in the internal space. It is presumed that this is due to contact. In the above two embodiments, a damping steel plate is used as a member for suppressing vibration, that is, a damping member. However, other damping members, for example, a rubber plate, a plate having a large mass, and a plate having a large specific gravity are used. Etc. are also effective. However, in order to obtain the required damping effect while keeping the weight and volume as small as possible, a damping steel plate which does not impose a great burden on cost is optimal.

In the above description, the measures for reducing the noise level are applied to the case 22b or 22a. However, it is considered that the noise level can also be reduced by the mounting method of the drive motor. FIG. 3 and FIG. 4 show an example of this, in which a stepping motor 33 as a driving motor is attached to a resin molded frame 40a via a cushion spring 41 as a cushioning material. Cushion spring 41
Is not as great as the damping steel sheet, but reduces the noise level of the recorder, which has been reduced in size and weight by resin molding, to a level somewhat lower than that of the conventional recorder.

[0021]

According to the present invention, there is provided a recorder for recording information on a recording medium by moving a pen, an ink jet recording head or the like by driving a stepping motor or a servo motor of the main unit. In a recorder in which a frame of the unit and a case accommodating the main unit in the housing are at least made of a resin mold, a vibration damping member is incorporated in the case. , The housing becomes difficult to resonate, and the internal vibration is attenuated by the vibration damping member, so that the level of noise going out is reduced.
Therefore, an increase in the noise level due to the resonance of the molded, compact and lightweight housing is suppressed, and a recorder with a low noise level can be provided (the invention of claim 1).

According to the first aspect of the present invention, since a part or the whole of the vibration damping member is integrated with the case as an insert when the case is made, an operation for incorporating the vibration damping member into the case becomes unnecessary. In addition, the space for the vibration damping member is not required, and the dispersion of the effects can be reduced by the complete integration. Therefore,
It is possible to provide a recorder which is small in cost, small in size and small in noise level variation.
Invention).

[0023] In the first or second aspect of the present invention, the damping member is a damping steel plate. The damping steel sheet is excellent in cost and performance as a practical damping member. Therefore, it is possible to reliably provide a recorder with low cost and low noise level (the invention of claim 3).

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the configuration of a housing of a second embodiment of a recorder according to the present invention.

FIG. 2 is a sectional view showing a configuration of a damping steel sheet.

FIG. 3 is an exploded perspective view showing a configuration of a main unit.

FIG. 4 is an explanatory view showing an attached state of a drive motor.

FIG. 5 is a perspective view showing the appearance of an example of a recorder according to the related art.

FIG. 6 is an exploded perspective view showing a configuration of a housing of a conventional example.

FIG. 7 is a perspective view showing the appearance of a conventional main unit.

FIG. 8 is an exploded perspective view showing the configuration of a conventional main unit.

[Description of Signs] 1 Recorder 2, 2a Housing 21 Door 22, 22a Case 23 Alarm Terminal 24 Input Terminal 25 Damping Steel Plate 251 Steel Plate 252 Rubber Layer 26 Insert Damping Steel Plate 3, 3a Main Unit 31 Head Drive Belt 32 Recording Head 33 Stepper motor 34 Printed board 35 Chart case 36 Chart paper 37 Motor gear 38 Belt drive gear 39 Paper feed motor 40, 40a Frame 41 Cushion spring

Claims (3)

[Claims] 1. A recorder for recording information on a recording medium by moving a pen, an ink jet recording head, or the like by driving a stepping motor or a servo motor of the main unit. A recorder in which a case accommodating the main unit is formed by at least a resin mold, wherein a vibration damping member is incorporated in the case. 2. The recorder according to claim 1, wherein a part or all of the vibration damping member is integrated with the case as an insert when the case is made. 3. The recorder according to claim 1, wherein said damping member is a damping steel plate.