JPH0611557B2 - Platen - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a platen for a printer.

[Prior art]

A conventional platen will be described with reference to FIG.
Flange 2 is fixed to each end of an aluminum pipe 1 so that it can be pivotally supported by an iron shaft 3, and a coating material 4 such as urethane rubber is wound around the outer periphery of the pipe 1 and the coating material is based on the shaft 3. 4. Finish with grinding. Next, a sprocket wheel 5 for paper feeding is fitted to both ends of the shaft 3, a bearing 6 is attached to and supported by the shaft 3, and an LF gear 7 is fixed to one or both ends of the shaft 3 to fix the LF. It is made rotatable by a gear 7 for use.

If the covering material 4 is made too thick, it is a soft material, so that it is deformed at the time of temperature change or processing, and the cost becomes high. This is because the outer diameter of the platen is generally about 30-40 mm, so about 20-
This resulted in the need for a central material of 34 mm, resulting in a composite structure in which the iron shaft 3 was pivotally supported on the aluminum pipe 1.

Therefore, such a conventional platen has a drawback that it is a great obstacle to weight reduction and cost reduction of the platen because the number of parts is large. Further, since the eccentricity of the outer peripheral surface of the platen becomes large due to the component structure, it is necessary to finish the grinding of the coating material 4, which results in a high cost.

[Object of the Invention]

The present invention has been made to solve the above drawbacks, and an object thereof is to provide a platen that is easy to manufacture and is lightweight.

[Structure of Invention]

To achieve this object, the present invention provides a cylindrical body,
A sprocket pin for paper feeding located on the outer periphery near both ends of the main body, a recess located on the outer peripheral surface of the main body between the sprocket pins, and a drive located on the end side of the outer peripheral surface of the main body with respect to the sprocket pins. A driven part that receives a rotational force from a source, a knob for hand-turning that has substantially the same diameter as the main body and is located coaxially with the main body at the end of the main body, and a surface of the knob on the sprocket pin side. A positioning groove for positioning the main body in the axial direction at the time of supporting the main body on the outer peripheral surface of the main body adjacent to each other is formed integrally with the main body so that it has substantially the same diameter as the main body. It is characterized by comprising a thin covering material provided in the recess and a sound absorbing material provided on an inner peripheral surface of the main body.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 8 is a cylindrical main body, and sprocket 9 for paper feeding is integrally formed on both outer circumferences. 10 is LF
A driven portion of a platen including a gear or pulley, and is integrally formed on one or both outer peripheral ends of the main body 8 outside the sprocket pin 9. Reference numeral 11 denotes a platen knob, which is integrally formed at the end of the main body 8 outside the sprocket pin 9 so as to be positioned coaxially with the main body 8. 1
Reference numeral 2 denotes a positioning groove for axially positioning the main body 8, which is integrally formed on the outer periphery of the main body 8 adjacent to the knob 11 in this embodiment.

Although the knob 11 is formed on the right side in FIG. 2 in this embodiment, it may be formed on the left side or the right side of the driven portion 10. Similarly, the driven portion 10 is formed on the left side in FIG. 2 in this embodiment, but may be formed on the right side.

Reference numeral 13 is a coating material such as urethane or neoprene rubber having a large friction coefficient, which is thinly applied or impregnated on the outer peripheral surface of the main body 8 inside the sprocket pin 9 to enable the feeding of roll paper. It should be noted that the concave portion 14 is formed at a position between the sprocket pins 9 on the outer periphery of the main body 8 for covering the covering material 13 to facilitate the covering work of the covering material 13.

Reference numeral 15 denotes a sound absorbing material which is the same as or different from the main body 8 and is attached to the inside of the main body 8 via a urethane foam or an adhesive layer.

A bearing 16 rotatably supports both ends of the main body 8. In this case, the outer diameter of the portion where the main body 8 is supported and the outer diameter of the portion where the covering material 13 is coated are formed to have the same size.

Next, the operation of the above-described configuration will be described. First, at the time of printing, the impactor on the platen is absorbed by the sound absorbing material 15 to perform a quiet printing operation.

Further, when the roll paper or the like is fed, the main body 8 rotates in accordance with the rotation of the driven part 10 by a drive source (not shown), and the roll paper or the like is coated on the coating material 13 with a large friction coefficient. The line feed is performed by the sprocket pin 9 of the main body 8 while closely adhering.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention provides a cylindrical main body, a sprocket pin for paper feeding located on the outer periphery near both ends of the main body, a concave portion located on the outer peripheral surface of the main body between the sprocket pins, and the sprocket pin. On the other hand, a driven portion which is located on the end side of the outer peripheral surface of the main body and receives a rotational force from a driving source, and a handwheel which has substantially the same diameter as the main body and is located coaxially with the main body at the end portion of the main body. And a positioning groove for positioning the main body in the axial direction when the main body is supported by a bearing located on the outer peripheral surface of the main body adjacent to the surface of the knob on the sprocket pin side. Since it has a structure including a thin covering material formed in the recess so as to have substantially the same diameter as the main body and a sound absorbing material provided on the inner peripheral surface of the main body, the following effects are obtained. can get.

That is, according to the present invention, since the whole body is composed of the three parts of the main body, the covering material, and the sound absorbing material, the number of parts is reduced, and an effect that a lightweight and inexpensive platen can be realized can be obtained.

Also, since the diameter of the knob formed integrally with the main body is almost the same as the diameter of the main body, it is easy to obtain roundness during manufacturing,
In addition to facilitating manufacturing, a positioning groove is provided adjacent to the knob, so even if the main body and the knob have approximately the same diameter, they can be easily positioned by the groove when they are supported by the bearing. You can also get the effect.

Further, according to the present invention, since the concave portion is formed in the main body and the thin coating material is provided in the concave portion, the roundness of the coating material can be obtained without grinding the coating material. This has the effect of making it easier and contributing to lower prices.

[Brief description of drawings]

FIG. 1 is a plan view of a conventional example, and FIG. 2 is a plan view showing an embodiment of the present invention. 8 ... Main body, 9 ... Sprocket pin, 10 ... Driven part, 13 ... Coating material, 15 ... Sound absorbing material, 16 ... Bearing

Claims (1)

[Claims] 1. A cylindrical main body, a sprocket pin for paper feed located on the outer periphery near both ends of the main body, a recess located on the outer peripheral surface of the main body between the sprocket pins, and an outer periphery of the main body with respect to the sprocket pin. A driven part located on the end side of the surface and receiving a rotational force from a drive source; and a hand-turning knob that has substantially the same diameter as the main body and is located coaxially with the main body at the end part of the main body. A positioning groove for positioning the main body in the axial direction when the main body is supported by a bearing located on the outer peripheral surface of the main body adjacent to the surface of the knob on the sprocket pin side, and A platen comprising: a thin covering material provided in the recess so as to have substantially the same diameter as the main body; and a sound absorbing material provided on an inner peripheral surface of the main body.