JP3385599B2 - Knob structure of printer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knob structure for a printer. In particular, the present invention relates to a knob structure that reduces noise.

[0002]

2. Description of the Related Art Conventionally, as a knob structure of a printer for reducing noise, one shown in FIGS. 3 and 4 is known (Japanese Utility Model Laid-Open No. 63-863).

In FIG. 3, reference numeral 1 is a case of the printer, and 2 is a case.
Is a platen provided inside the case, and 3 is a knob provided outside the case 1 for operating the platen 2. A print head (not shown) is arranged on the platen 2 so as to face the platen 2.

In such a printing apparatus, noise generated mainly from the print head leaks from a hole 1a formed in the case 1 for mounting the knob 3.

Therefore, in the apparatus shown in FIG. 3, the noise absorbing member 4 is provided around the hole 1a to reduce noise.

However, in this device, since there is a gap C between the inner end 3a of the knob 3 and the outer surface of the case, noise that cannot be completely absorbed by the sound absorbing material 4 passes directly from the hole 1a to the gap C. There is a problem of leakage.

The knob structure shown in FIG. 4 is designed to solve this problem. An annular recess 1b is formed on the outer surface of the case, and the inner end 3a of the knob 3 is fitted in the annular recess 1b. .

[0008]

The knob 3 rotates integrally with the platen 2.

Therefore, the knob structure shown in FIG.
There are the following problems.

That is, the annular recess 1b and the inner end 3 of the knob 3
When trying to make the gap with a as small as possible, the annular recess 1b
And the inner end 3a of the knob 3 come into close contact with each other, or a non-uniform contact state occurs due to a dimensional error in manufacturing or the like, and smooth rotation of the platen 2 driven by a motor cannot be obtained during operation of the printing apparatus. There is a risk.

On the other hand, in order to surely obtain the smooth rotation of the platen 2 driven by the motor, a gap is created between the annular recess 1b and the inner end 3a of the knob 3, and the knob structure shown in FIG. Similarly, there is a direct noise leakage problem. In order to solve this problem, the knob structure shown in FIG.
Although the sound absorbing material 5 is provided inside the knob 3, it is not preferable to provide the sound absorbing material 5 because it increases the number of parts and the manufacturing process.

An object of the present invention is to solve the above problems, to reduce noise without necessarily requiring a sound absorbing material, and to obtain a smooth rotation state of a platen driven by a motor. It is to provide a knob structure of a printing device capable of performing.

[0013]

In order to achieve the above object, a knob structure of a printer according to claim 1 is provided with a knob for operating a platen provided inside the case provided outside the case. The knob structure has a first chamber communicating with the space inside the case, and a second chamber communicating with the first chamber via a first throttle portion. Is communicated with the outside of the knob via the second throttle portion.

According to a second aspect of the present invention, there is provided the knob structure of the first aspect, wherein the first chamber is formed by a cylindrical partition provided in the knob.
A cylindrical portion is formed in the case, the distal end thereof being close to the cylindrical partition wall and entering the first chamber, and the first throttle portion is formed by an overlapping portion of the cylindrical partition wall and the cylindrical partition wall. It is characterized by being formed.

[0015]

According to the knob structure of the printer of claim 1,
The knob has a first chamber that communicates with the space inside the case, and a second chamber that communicates with the first chamber via a first throttle portion, and the second chamber has a second throttle portion. Since it communicates with the outside of the knob, the noise generated in the case first enters the first chamber,
Next, after being squeezed by the first squeezing section, it enters the second chamber and expands, and then is squeezed by the second squeezing section and then discharged outside the knob.

Thus, the noise generated in the case is
In the process of being discharged to the outside of the case, throttling and expansion are repeated, so that it is significantly damped.

Further, since the structure is such that the noise is attenuated by the diaphragm and the expansion, it is not always necessary to use the sound absorbing material, and it is not necessary to bring the knob and the case into close contact with each other.

Therefore, according to the present invention, it is possible to achieve a smooth rotation state of the platen driven by the motor while reducing the noise without necessarily requiring the sound absorbing material.

According to the knob structure of the printing device of the second aspect, in the knob structure of the printing device of the first aspect, the first chamber is formed by a cylindrical partition wall provided inside the knob, and the case is formed. Has a cylindrical portion whose tip enters the first chamber in the vicinity of the cylindrical partition wall,
Since the first throttle portion is formed at the overlap portion between the cylindrical portion and the cylindrical partition wall, the first throttle portion has a length corresponding to the overlap portion.

Therefore, the noise is effectively throttled and attenuated in the process of entering the first chamber into the second chamber.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a knob structure of a printing apparatus according to the present invention, and FIG. 2 is a right side view of the knob.

In FIG. 1, 10 is a case of the printing apparatus, which is composed of an upper case 10a and a lower case 10b.

A platen 20 is provided in the case 10. The platen 20 has a shaft 21, and the shaft 21 is rotatably supported by a frame (not shown) provided in the case. The platen 20 is driven by a motor to rotate when the printing apparatus is in operation. A print head (not shown) is provided on the platen 20 so as to face the platen 20.
Are arranged.

Reference numeral 30 denotes a knob, which is a shaft 21 of the platen 20.
Attached to the end of.

Inside the knob 30, a connecting cylinder 3 for connecting to the shaft 21 is provided.
3 and a cylindrical partition wall 31 that is concentric with the connecting cylinder 33 are integrally formed. Since the cross-sectional shape of the end of the shaft 21 is D-shaped and the inner shape of the connecting cylinder 33 is also D-shaped, by fitting the connecting cylinder 33 to the end of the shaft 21, the knob 30 is attached to the shaft 21. It is attached in a state in which relative rotation with respect to is impossible. Therefore, when the printing device is not in operation, the platen 20 can be rotated by operating the knob 30.

The knob 30 has a first chamber 41 and a second chamber 42 inside thereof. The first chamber 41 is formed by the connecting cylinder 33 and the cylindrical partition wall 31, and the second chamber 42 is formed by the cylindrical partition wall 31 and the peripheral wall 32 of the knob 30. Reference numeral 34 is a rib that reinforces the connecting cylinder 33 and the cylindrical partition wall 31 and at the same time divides the first chamber into six parts, and 35 reinforces the cylindrical partition wall 31 and the peripheral wall 32 of the knob 30 and at the same time the second chamber 42. It is a rib that divides only the bottom into six.

On the other hand, a first cylindrical portion 11 and a second cylindrical portion 12 are provided at the portion of the case 10 facing the knob 30 and the shaft 2
All of them are formed concentrically and integrally with each other.

The tip end 11a of the first cylindrical portion 11 enters the first chamber 41 in the vicinity of the cylindrical partition wall 31 of the knob, and the first cylindrical portion 11 and the cylindrical partition wall 31 are overlapped with each other. The first narrowed portion 51 is formed by the lap portion.

The tip 12a of the second cylindrical portion 12 is close to the inner end 32a of the peripheral wall of the knob, and the second throttle portion 52 is formed by the front end surface of the second cylindrical portion 12 and the inner end surface of the peripheral wall. Are formed. Since the side surface of the upper case 10a in this embodiment is inclined, the height of the second cylindrical portion is changed accordingly.

Further, as a result of forming the first cylindrical portion 11, the third narrowed portion 53 is formed at the overlapping portion of the first cylindrical portion 11 and the connecting cylinder 33.

That is, the case internal space S1 communicates with the first chamber 41 via the third throttle portion 53, the first chamber 41 communicates with the second chamber 42 via the first throttle portion 51, and the second chamber 42 communicates with the knob outside space (that is, the printer outside space) S2 via the second throttle portion 52.

According to the knob structure as described above, the following operational effects can be obtained.

(I) The noise generated in the case internal space S1 is first throttled by the third throttle portion 53, enters the first chamber and inflates, and then is throttled by the first throttle portion 51, and then the second noise. Chamber 42
To be inflated and then further squeezed by the second squeezing portion 52, and then discharged into the knob outside space S2.

As described above, the noise generated in the case inner space S1 is repeatedly throttled and expanded in the process of being emitted to the case outer space S2, and is thereby significantly attenuated.

(Ii) Since the structure is such that noise is attenuated by the diaphragm and expansion, a sound absorbing material is not always necessary.

(Iii) It is not necessary to bring the knob 30 and the case 10 into close contact with each other because the noise is attenuated by the diaphragm and expansion. That is, a gap as the third throttle portion 53 is formed between the connecting cylinder 33 and the first cylindrical portion 11, and the first throttle portion 51 is provided between the cylindrical partition wall 31 and the first cylindrical portion 11. Is formed, and the inner end 32 of the peripheral wall is formed.
Since a gap serving as the second diaphragm 52 is formed between a and the tip 12a of the second cylindrical portion 12, a smooth rotation state of the platen driven by the motor can be obtained when the printing apparatus is operating. .

(Iii) The third throttle portion 53 has a length (axial length) corresponding to the overlapping portion between the first cylindrical portion 11 and the connecting cylinder 33, and the first throttle portion 51. Has a length corresponding to the overlapping portion of the first cylindrical portion 11 and the cylindrical partition wall 31, so that noise is transmitted from the case internal space S1 to the first chamber 41, and further from the first chamber 41. In the process of entering the second chamber 42, it is effectively throttled and attenuated.

(Iv) In the conventional knob structure shown in FIG. 4, since the annular recess 1b is formed on the outer surface of the case,
Although there is a drawback that the strength of this portion is reduced, the structure of the present embodiment does not require the annular recess 1b, so that the strength of the case 10 is not reduced.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

For example, the second diaphragm 52 is the first diaphragm 51.
Similarly, the diameter of the second cylindrical portion 12 is reduced, or the peripheral wall 32 of the knob is increased, and the height of the second cylindrical portion 12 is increased to increase the diameter of the second cylindrical portion 12 and the peripheral wall 32 of the knob. Can also be formed by overlapping.

The first throttle portion can also be formed by making a small hole in the cylindrical partition wall 31. Similarly, the second throttle portion also has the second cylindrical portion 12 and / or the peripheral wall 3 of the knob.
It can also be formed by making a small hole in 2.

When the shaft 21 enters the first chamber 41 because the connecting cylinder 33 is short (or is not provided), the third throttle portion 53 has an overlapping portion between the first cylindrical portion 11 and the shaft 21. The first chamber is formed by the shaft 21 and the cylindrical partition wall 31.

[0044]

According to the present invention, it is possible to reduce noise without necessarily requiring a sound absorbing material and to obtain a smooth rotating state of a platen driven by a motor.

[0045]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a knob structure of a printing apparatus according to the present invention.

FIG. 2 is a right side view of the knob of the above embodiment.

FIG. 3 is an explanatory diagram of a conventional technique.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

10 cases 11 cylindrical part 20 Platen 30 knobs 31 Cylindrical bulkhead 41 Room 1 42 Second Room 51 First diaphragm 52 Second throttle unit

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Claims (2)

(57) [Claims] 1. A knob structure of a printing apparatus, wherein a knob for operating a platen provided in the case is provided outside the case, the knob being in communication with a space inside the case.
A chamber and a second chamber communicating with the first chamber via a first throttle portion, and the second chamber communicates with the outside of the knob via the second throttle portion. Printing device knob structure. 2. The first chamber is formed by a cylindrical partition wall provided in a knob, and the case has a cylindrical portion with a tip thereof entering the first chamber in the vicinity of the cylindrical partition wall. The knob structure of the printing apparatus according to claim 1, wherein the first throttle portion is formed at an overlapping portion of the cylindrical portion and the cylindrical partition wall.