JPH0617943U - Platen for impact printer - Google Patents

Abstract

(57) [Summary] [Purpose] A compact and simple structure ensures sufficient rigidity,
At the same time, keep quiet during printing. [Structure] A reinforcing member 8 having a U-shaped cross section is bonded and fixed to a long plate-shaped platen main body 7, and the rigidity of the platen main body 7 is sufficiently secured by the reinforcing member 8. In the platen body 7, a slit-shaped void 10 is formed at the joint with the reinforcing member 8, and the void 10 allows the propagation efficiency of vibration inside the platen body 7 and the platen body 7 to the reinforcing member 8. The propagation efficiency of vibration is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a platen used for an impact printer.

[0002]

[Prior art]

 The impact printer is equipped with an impact-type print head facing the platen, and this print head can print on recording paper via an ink ribbon.

By the way, in this type of printer, the printing element of the print head collides with the platen at the time of printing to vibrate the platen, and the vibration propagates to the printer frame to generate noise. Therefore, in the past, a hard elastic material such as nitrilobutadiene rubber (NBR) was provided on the entire platen or on the outer periphery of the platen to absorb the vibration energy applied to the platen by the internal friction of the platen. The propagating vibration was reduced to maintain quietness during printing.

[0004]

[Problems to be solved by the device]

 However, the conventional platen is large in size in order to ensure sufficient rigidity and to absorb the vibration energy applied during printing sufficiently by internal friction, which prevents the printer from becoming smaller. It was.

It is an object of the present invention to provide a platen for an impact printer, which is small in size and has a simple structure, can secure sufficient rigidity, and can maintain quietness during printing.

[0006]

[Means for Solving the Problems]

 The impact-type platen for a printer according to the present invention includes a platen body in the form of a long plate and a reinforcing member bonded and fixed to the outer peripheral surface of the platen body, which faces the print head, excluding the front surface. The platen body is supported by a member through a member, and a slit-like void is formed in the joint portion with the reinforcing member in the platen body.

[0007]

[Action]

 According to the present invention, the platen body is reinforced by the reinforcing member, and the vibration energy applied to the platen body during printing is transmitted from the platen body to the printer frame through the reinforcing member. Since a void is formed in the part, this void reduces the efficiency of vibration propagation from the platen body to the reinforcing member. Moreover, since the void is formed in the platen body in the shape of a slit, the efficiency of vibration propagation inside the platen body is also reduced by the void, which significantly increases the efficiency of vibration propagation to the printer frame. Will be reduced.

[0008]

【Example】

An impact printer to which the platen according to the present invention is applied will be described with reference to the drawings. In this printer, as shown in FIG. 1, a platen 2 is provided facing the nose portion 1a of the print head 1, and a recording paper 3 is fed between the nose portion 1a of the print head 1 and the platen 2. It is designed to be printed.

The print head 1 is supported movably in a direction orthogonal to the paper feed direction via guide shafts 4 and 5, and is moved in a direction orthogonal to the paper feed direction during printing. The print head 1 is of an impact type, and a printing element (not shown) collides with a platen 2 via an ink ribbon (not shown) and the recording paper 3 at the time of printing so that the recording paper 3 is printed by this operation. Has become.

The platen 2 is extended along the moving direction of the print head 1, and is fixedly supported by the printer frame 6 at both ends as shown in FIG. The platen 2 is provided with a platen body 7 in the form of a long plate, and the nose portion 1a of the print head 1 is opposed to one surface 7a of the platen body 7.

A reinforcing member 8 is bonded and fixed to the platen main body 7 with an adhesive 9 over the entire outer peripheral surface except the front surface 7 a facing the print head 1 in the longitudinal direction. It is fixedly supported by the printer frame 6.

The reinforcing member 8 is formed in a U-shaped cross section, and the back surface 7b of the platen body 7 is joined and fixed to the substrate portion 8a and the side surfaces 7c of the platen body 7 are joined and fixed to each leg plate portion 8b. There is. A void portion 10 is formed between the joint surface between the reinforcing member 8 and the platen body 7.

A plurality of voids 10 are partially provided in the circumferential direction of the joint surface between the reinforcing member 8 and the platen body 7, and these are provided over the entire longitudinal direction of the joint surface between the reinforcing member 8 and the platen body 7. It is provided continuously. The void portion 10 is a slit-shaped void portion 10a extending in parallel to the printing direction from the joint surface between the reinforcing member 8 and the platen body 7, and the joint surface between the platen body 7 and the reinforcing member 8 is printed. The slit-shaped void portion 10b extends in a direction perpendicular to the direction, and each of these extends to the inside of the platen body 7 from between the joint surfaces of the platen body 7 and the reinforcing member 8. That is, a notch is formed at a right angle on the back surface 7b of the platen body 7, and a slit-shaped void 10a is formed between the back surface 7b of the platen body 7 and the substrate portion 8a of the reinforcing member 8 by this notch. Further, a notch is formed at a right angle on each side surface 7c of the platen body 7, and a slit-shaped void portion 10b is formed between each side surface 7c of the platen body 7 and each leg plate portion 8a of the reinforcing member 8 by this notch. There is.

According to the above structure, the platen body 7 is reinforced by the reinforcing member 8, and sufficient rigidity can be secured with a small size and a simple structure. In particular, since the reinforcing member 8 has a U-shaped cross section, sufficient rigidity can be secured without making the reinforcing member 8 so thick, and it is effective for downsizing.

At the time of printing, the vibration energy applied to the platen body 7 is transmitted from the platen body 7 to the printer frame 6 via the reinforcing member 8. Since the space 10 is formed, the space 10 reduces the propagation efficiency of vibration from the platen body 7 to the reinforcing member 8. Moreover, since the void 10 is formed in the platen body 7 in a slit shape and extends from the joint surface between the platen body 7 and the reinforcing member 8 to the inside of the platen body 7 for a long time, the void 10 allows the platen body 7 to move. The efficiency of vibration propagation inside is also reduced, and thus the efficiency of vibration propagation to the printer frame 6 is greatly reduced, and quietness during printing can be maintained.

Therefore, with a small size and a simple structure in which the reinforcing member 8 is bonded and fixed to the platen body 7 having a long plate shape, sufficient rigidity can be ensured and the propagation efficiency of vibration to the printer frame 6 can be greatly increased. It is possible to maintain the quietness at the time of printing.

In addition, in the above-mentioned embodiment, the void portion 10 is made to extend in the printing direction and the direction perpendicular to the printing direction, but the present invention is not limited to this, and the void portion 10 is made to extend obliquely with respect to the printing direction. You may make it do.

Further, in the above-described embodiment, the void portion 10 is continuously formed over the entire region in the longitudinal direction of the joint surface between the platen body 7 and the reinforcing member 8. However, the void portion 10 is strengthened with the platen body 7 and the reinforcing member. It may be provided intermittently in the longitudinal direction of the joint surface with 8. In this case, the void portion 10 may be provided in the entire circumferential surface of the joint surface between the platen body 7 and the reinforcing member 8.

[0019]

[Effect of device]

 As described above, according to the platen for a printer of the present invention, the reinforcing member is joined and fixed to the long plate-shaped platen main body, and the platen main body is supported by the printer frame via the reinforcing member and the platen main body of the platen main body is supported. Since a slit-shaped void is formed in the joint to the reinforcing member, sufficient rigidity is secured with a compact and simple structure that simply joins and fixes the reinforcing member to the long plate-shaped platen body, and the printer frame. It has the excellent effect of significantly reducing the propagation efficiency of vibrations to the printer and maintaining quietness during printing.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a printer to which a platen according to the present invention is applied.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 platen 6 printer frame 7 platen body 8 reinforcing member 10 void

Claims (1)

[Scope of utility model registration request] 1. A platen body having an elongated plate shape, and a reinforcing member bonded and fixed to an outer peripheral surface of the platen body except a front surface facing the print head, wherein the platen body has the reinforcing member interposed therebetween. An impact type printer platen, which is supported by a printer frame and has a slit-like void portion formed in a joint portion with the reinforcing member in the platen body.