JPH0444870A - Sound deadening structure for platen - Google Patents

Abstract

PURPOSE:To obtain effectively a sound deadening effect in simple structure by interposing a sound deadening member made of a material having physical properties different from those of a platen and a frame therebetween when the platen to be used for an impact type printing device and the frame supporting said platen are joined together. CONSTITUTION:In the case where a roll-shaped platen is used, a substantially cylindrical sound deadening member 1 made of a material having physical properties different from those of a bearing 3 for a platen shaft 5 is interposed between the bearing and a frame. Accordingly, this can be practiced even to a ready-made only by enlarging the diameter of the hole of the bearing part 4a of the frame, and freedom of a material, a shape and the like is also greater. Further, in the case of a flatbed-shaped platen 6, a flat-shaped sound deadening member 1 made of a material having physical properties different from those of both the platen 6 and a frame 4 is interposed between the frame 4 and a mounting plate 8 and between the platen 6 and the mounting plate 8, respectively, when the platen 6 and the frame 4 are fastened together with the aid of the mounting plate 8. Either one of the two sound deadening members 1, 1 may be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound-deadening structure for a platen used in impact type printing devices such as impact dot printers, daisy-wheel printers, and typewriters.

[Conventional technology]

Conventionally, the platen's sound-deadening structure used in impact printing devices has included lead, springs,
Sound-absorbing structures using sound-absorbing materials such as rubber are known. Also, a sound-dampening structure is known in which a sound-absorbing material or a vibration-damping material is used in the printing mechanism or the exterior (problem to be solved by the invention). Moreover, since it involves multiple steps, there is a problem in that the manufacturing cost increases. In addition, implementing the sound-absorbing structure requires space for installing sound-absorbing or vibration-damping materials on the platen, printing mechanism, and exterior, which limits design.

Furthermore, when implementing the above-mentioned sound-absorbing structure, the weight of the platen and printing mechanism increases, requiring reinforcement to maintain strength, which also increases the weight of the entire product, including the sound-absorbing material. Ta.

Therefore, the present invention utilizes a volumetric sound deadening structure that takes up less space.
The purpose is to obtain an effective sound deadening effect at low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention interposes a sound deadening member made of a material having different physical properties from those of the platen and the frame, between the platen and the seven frames for fixing the platen.

[Effect]

According to the present invention, a sound deadening member is interposed between the platen and the frame, and since the sound deadening member is made of a material having different physical properties from those of the platen and the frame, noise generated on the platen during printing by the impact method can be avoided. The vibrations are absorbed by the sound deadening member and transmitted to the frame. Therefore, the noise generated from the platen and frame is reduced.

Since the sound-damping structure of the present invention is such that a sound-damping member is interposed between the platen used in an impact printer and the frame that fixes it,
The manufacturing method is simple and the manufacturing cost is low. Also,
Since you can freely select the material of the sound deadening member to intervene,
There is a high degree of freedom in responding to required characteristics.

In addition, since only the intervention of a sound deadening member is required, installation is easy, and it can be easily applied to ready-made products.

Furthermore, according to the present invention, the noise reduction structure on the platen side and the frame side can be omitted or simplified, so that the degree of freedom in selecting the material, wall thickness, and shape of the platen and frame can be increased.

On the other hand, since it can be implemented in combination with a conventional sound deadening structure, a better sound deadening effect can be obtained if the planar structure is used at the same time.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing an example of a sound-deadening structure in a roll-shaped platen, and FIG. 2 is a cross-sectional view of the bearing shown in FIG. 1. In this embodiment, a substantially cylindrical sound deadening member 1 made of a material having different physical properties from the bearing 6 of the platen shaft 5 is interposed.

The above example shows an example of a lifting platform that is applied to a roll-shaped platen, which is the most commonly used platen among the platens currently used in impact printing devices, and can also be applied to ready-made products. The frame bearing has a large hole diameter in part 4α (it can be implemented by simply making it), and it also has a large degree of freedom in terms of material, shape, etc. (it is low cost, takes up a small space, and has a sound-dampening structure that can be used quickly). .

FIG. 6 is a perspective view showing an embodiment of the sound-dampening structure in the flatbed-shaped platen 6, and FIG. 4 is a cross-sectional view of the platen mounting portion of FIG. When tightening the frame 4 and the mounting plate 8,
Between the frame 4 and the mounting plate 8 and between the platen 6 and the mounting plate 8, a flat sound deadening member 1 made of a material having different physical properties from both the platen 6 and the frame 4 is interposed. Note that of the two sound deadening members 1, 1, the negative one can also be omitted.

The flatbed-shaped platen 6 mentioned above will become more and more popular in the future due to improvements in paper feeding performance and the ability to handle paper types, but in general, compared to the conventional roller-shaped platen, it is possible to print on a flat plate. Due to this structure, it had the disadvantage that the impact sound during printing was diffused and the printing sound was loud. However, with this implementation, the silencing effect can be easily and effectively changed.

The embodiments shown in FIGS. 1 to 4 can be implemented simultaneously with the conventional silencing structure, and by implementing both at the same time, it is possible to obtain better silencing effects.

〔Effect of the invention〕

The sound deadening structure of the present invention is such that when a platen used in an impact type printing device and a frame supporting the platen are connected, a sound deadening member made of a material having different physical properties from the platen and the frame is intervened. The manufacturing method is simple and the manufacturing cost is low. Furthermore, since the material of the intervening sound deadening member can be freely selected, there is an effect that the degree of freedom in responding to required characteristics is increased.

Furthermore, since the sound damping member is easy to attach, the present invention has the advantage that it can be easily applied to ready-made products.

Further, according to the present invention, since the sound deadening structure on the platen side and the frame side can be omitted or simplified, there is also the effect that the degree of freedom in selecting the material, wall thickness, and shape of the platen and frame can be increased.

On the other hand, since it can be implemented in combination with a conventional sound damping structure, a better sound damping effect can be obtained if the planar structure is used at the same time.

[Brief explanation of drawings]

Fig. 1 is a three-dimensional view showing an example in which the present invention is applied to a roll-shaped platen, Fig. 2 is a cross-sectional view of the bearing shown in Fig. 1, and Fig. 5 is a sectional view of the bearing shown in Fig. FIG. 4 is a three-dimensional view showing an example in which the present invention is applied to a platen, and FIG. 4 is a cross-sectional view of the platen mounting portion of FIG. 3. 1--...Sound deadening member 2--Roll shaped platen 5--
・・Bearing 4−− ・−・・・・Frame 5−− ・・・・−Platen shaft 6−−・−・−Flat bed shape platen 7−・−・
-Tighten with 8 screws ・------Platen mounting plate or above Applicant Seifu Ebson Co., Ltd. Agent Patent attorney Kizobu Suzuki (and 1 other person) Person? Neo Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A sound deadening structure for a platen in a printing device that prints on a recording medium using an impact method, wherein the sound deadening structure is made of a material having different physical properties from the platen and the frame between the platen and a frame for fixing the platen. A sound deadening structure for a platen characterized by intervening members.