JPH0346923Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a paper feeding device for a printer.

[Technical background of the invention]

Conventionally, as shown in FIG. 1, a pinch roll 3 is attached to a paper pan 2 installed along a platen 1, and a plurality of movable arms 5 are rotated while being biased by a spring 6 to a fixed arm 4 fixed to a frame or the like. These movable arms 5 are connected to the paper pan 2, and the pinch roll 3 is connected to the platen 1.
A control lever 8 is rotatably fitted to the support shaft 7 of the platen 1, and a pin 9 provided upright on the control lever 8 is inserted into a window 10 formed in a frame (not shown). A lever 1 that projects and limits excessive movement of the operating lever 8 and is connected to the movable arm 5.
1 is connected to the support shaft 12, and therefore, when inserting paper between the paper pan 2 and the platen 1, the operating lever 8 is rotated counterclockwise to push down the lever 11, and the movable The arm 5 was moved downward together with the paper pan 2, paper was inserted with a gap between the platen 1 and the pinch roll 3, and the support shaft 12 held by the frame was prevented from coming off by the retaining ring 13. Something exists. Although such a structure is only one example of the conventional structure, many other examples are basically the same even if the details are different.

[Problems with background technology]

However, in the above case, the position after the operating lever 8 is rotated to the right or left is the window 10 formed in the frame.
The position of the paper pan 2 is regulated by the tip of the operating lever 8, and the position of each movable arm 5 relative to the fixed arm 4 is
The distance between the platen 1 and the paper pan 2 is not constant due to variations in the movable arms 5 relative to the paper pan 2, etc.
It is extremely difficult to uniformly join the pinch rolls 3 to each other. This appears as an error in paper feed pitch and cannot be ignored. Furthermore, dimensional control is troublesome and manufacturing is difficult. Furthermore, the support shaft 12 of the lever 11 that separates the paper pan 2 from the platen 1 is passed through the frame.
It is necessary to prevent the support shaft 12 from coming off. For this purpose, the retaining ring 13 is fixed to the support shaft 12, but it is difficult to assemble and there is a risk that the retaining ring 13 may be lost.

[Purpose of invention]

This invention was made in view of the above points, and the object is to provide a paper feeding device for a printer that is easy to manufacture and can feed paper accurately.

[Summary of the idea]

This device fixes a plurality of holders that elastically hold the paper pan to a spindle that is biased in one rotational direction, and therefore, in addition to the moment of the spindle, the elasticity of each holder The paper pan is pressed against the platen by force so that all the pinch rolls are evenly bonded to the platen, so paper feeding by the platen is accurate, and individual dimensional errors are absorbed by the elasticity of the holder. Furthermore, as a means for attaching the support shaft, small diameter parts are formed at both ends of the support shaft, and the small diameter parts of the support shaft are inserted into bearing holes that are open at one end formed in opposing frames, thereby forming the small diameter parts. The step part that is inevitably formed on the spindle is fixed to the surface of the frame to fix the movement of the spindle in the thrust direction, thus simplifying the mounting structure and work of the spindle. This is what I did.

[Example of idea]

An embodiment of this invention will be explained based on FIGS. 2 to 4. Components that are the same as those described in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted. A support shaft 14 parallel to the support shaft 7 of the platen 1 is provided. A small diameter portion 15 formed by a groove is provided at one end of this support shaft 14.
and a small diameter portion 16 having a certain axial center length. A hole 18 having a larger diameter than the maximum diameter near the end of the support shaft 14 and a bearing hole 19 that is open at one end and communicate with a part of the hole 18 are formed in the opposing frames 17 . The small diameter portions 15 and 16 are rotatably fitted into these bearing holes 19, and movement of the support shaft 14 in the thrust direction is prevented by contact between the stepped portions 20 of the small diameter portions 15 and 16 and the inner surface of the frame 17. has been done. Furthermore, a holder 21 made of a plurality of elastic metal plates and spring hanging plates 22 and 23 located at both ends of the support shaft 14 are welded to the support shaft 14 . One end of a spring 24 is fixed to these spring hanging plates 22 and 23, thereby biasing the support shaft 14 clockwise. One spring hanging plate 2
3 extends forward, and has a downwardly sloping slope 25 and an insertion portion 26 cut out from the side edge at its tip.

Next, a paper pan 2 is provided. This paper pan 2 holds a plurality of pinch rolls 3 in two rows and has an opening 27 for joining these pinch rolls 3 to the platen 1. Further, on the outer peripheral surface of the paper pan 2, there is a joint surface 28 that joins to the upper surface of the holder 21, and a protrusion that projects from the joint surface 28 and projects into a hole 29 formed in the holder 21 with a slight play. 30 is formed. The lower end of the operating lever 8, which is an operating section fitted to the support shaft 7 of the platen 1, is inserted into the insertion portion 26, and a pin 31 facing the slope 25 is erected at the lower end of the operating lever 8. It is set up.

In such a configuration, as shown in FIG. 2, the support shaft 14 is biased clockwise by the force of the spring 24, and therefore exerts a clockwise moment on the paper pan 2 via the holder 21.
Each holder 21 also presses the paper pan 2 against the platen 1 by its own elasticity. Therefore, even if the mounting position of the holding body 21 is slightly deviated with respect to the support shaft 14, the dimensional error is absorbed by the bending action of the holding body 21, and all the pinch rolls 3 are uniformly joined to the platen 1. Is possible. Therefore, it is possible to accurately feed paper using the platen 1. It requires relatively rough management to maintain dimensional accuracy and is easy to manufacture. Also,
After the support shaft 14 is inserted into the hole 18, the small diameter portion 15,1
6 into the bearing hole 19 prevents movement in the sliding direction, so assembly is easy. In addition,
When the bearing hole 19 is opened at the side edge of the frame 17, it is not necessary to form the hole 18.

As shown in FIG. 3, when the operating lever 8 is rotated counterclockwise against the force of the spring 24, the pin 31 pushes the slope 25, so a counterclockwise force is applied to the spring plate 23, and the support shaft 14 rotates together with the holder 21, and the paper pan 2 is deflected downward.
Therefore, the pinch roll 3 is separated from the platen 1, and the paper is inserted between them. Note that excessive movement of the operating lever 8 is restricted by the insertion portion 26.

[Effect of idea]

As mentioned above, this invention restricts the rotation range of the operation part by the insertion part formed in the holder, and
When the pinch roll is pressed against the platen, the operating body is prevented from interfering with the holder, and the paper pan is held elastically by the holder fixed to the spindle, so the paper pan All the held pinch rolls are evenly connected to the platen, allowing for accurate paper feeding.
In addition, the elasticity of the holder can absorb individual dimensional errors, making it easy to manufacture.Furthermore, the mounting means for the spindle that rotates the holder can be mounted using small diameter sections formed at both ends of the spindle. It is possible to prevent movement in the thrust direction simply by dropping it into the hole, and has the effect of greatly simplifying the mounting structure and work of mounting the support shaft.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional example, Fig. 2 is a side view showing an embodiment of this invention, Fig. 3 is a side view of the paper pan separated from the platen, and Fig. 4 is a side view showing the paper pan separated from the platen.
The figure is an exploded perspective view with a portion thereof cut away. 1...Platen, 2...Paper pan, 3...
Pinch roll, 8... Operation lever (operation section), 1
4... Support shaft, 15-16... Small diameter portion, 17... Frame, 19... Bearing hole, 21... Holder.

Claims (1)

[Scope of utility model registration request] A paper pan to which a pinch roll is attached facing the platen is provided, a small diameter portion and a stepped portion are formed on a support shaft parallel to the platen, and a small diameter portion and a step portion are formed on the opposing frame, and the movement in the axial direction is stopped by the step portion and the A bearing hole with an opening at one end is formed to rotatably hold the small diameter portion, a plurality of holders for resiliently holding the paper pan are fixed to the support shaft, and the support shaft is biased in one rotation direction. an operating unit provided with a biasing body that causes the paper pan to approach the platen, and a pin on the platen that rotates the spindle in a direction that abuts the holding body and moves the paper pan away from the platen; Rotatably attach the
A paper feeding device for a printer, characterized in that the holding body is formed with an insertion portion that restricts a rotation range of the operating portion.