JPS60231B2 - Holding structure of paper guide plate in printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding structure for a paper guide plate provided near the bottom of the platen along the end surface of the platen.

When loading paper on the printer's platen and feeding the paper, it is necessary to correctly guide the paper fed by the paper feed roller between the platen and the feed roller.
As shown in the figure, a grade guide plate 5 is provided below the platen 1 and close to the peripheral surface of the platen.

Since the paper guide plate 5 needs to be removed for inspection of the internal mechanism of the feed loaf, etc., a notch 12 is usually provided in the placket 11 provided at both ends of the paper guide plate 5, and a member for holding the feed roller, such as a feed roller holding arm, is attached to the plate. The support shaft 9 provided at 8 is inserted into the notch 12 to support it, and its rear end is held in position by being pulled backward by a spring 6 stretched almost horizontally between it and the frame 7 of the printer. Note that the paper guide plate 5 is provided with escape holes 13 at appropriate locations for bringing the feed rollers 2 and 3 into contact with the platen 1.In addition to supporting the paper guide plate 5, The support shaft 9, which also supports the feed roller support arm 4, is connected to the shaft 10 by an operation lever (not shown).
It is provided at the tip of the holding arm 8 that rotates around the. In the conventional device, the shape of the notch 12 provided in the bracket 11 at both ends of the grade guide plate 5 is a paper guide plate with an opening at the bottom, as shown in FIGS. 2 and 3. It forms a straight line almost perpendicular to the plane of 5.

Therefore, if the feed loafs 2 and 3 are moved toward and away from each other with the platen assembly removed for inspection, etc.,
The support shaft 9 that supports the paper guide plate 5 rotates rapidly around the shaft 10, and an impact force is applied to the support point of the paper guide plate 5 in approximately the same direction as the notch 12, and the notch 12 is supported. When it comes off the axis, the paper guide plate 5 is swung around the attachment end of the spring 6 on the frame 7 side as shown in FIG. 4, and the normal support state is no longer maintained. In addition, even in a printing device that does not have a puller 6 between the frame 7 and the paper guide plate 5, when inspecting or replacing the platen with a different specification, it is possible to remove the feed roller with the platen removed. When the operating lever is moved, the feed roller support arm suddenly moves due to the spring force, so the connection between the notch 12 of the paper guide plate 5 and the shaft 9 may come off.

Not only does it take time and effort to reset the paper to the proper support state, but if you inadvertently use the platen with the paper guide plate 5 removed, or with the platen attached without setting it correctly, the paper may fall on the platen. If the paper is not guided between the peripheral surface and the feed rollers 2 and 3, it will not only be impossible to feed the paper but also damage the paper.

Furthermore, if the platen is attached with the paper guide plate 5 set in the correct position on one side, for example, and with the shaft 9 not connected to the notch 12 on the other side, Unreasonable force is applied to the feed rollers 2, 3 and other related parts, which not only makes it impossible to feed the paper smoothly, but also may cause damage or deformation of the parts. This invention eliminates the above-mentioned drawbacks of the conventional printer grade guide plate holding structure, and allows the paper guide plate to be replaced when necessary.
As before, it can be easily removed and installed by hand, and the paper guide plate will not detach from the support shaft against the operator's will even if a shock is applied due to the feed roller's nesting operation with the platen removed. It is an object of the present invention to provide a holding structure for a paper guide plate that can maintain a normal holding state without causing any damage.

To explain this invention based on drawings showing embodiments, as shown in FIGS. 5 to 7, the plackets 11 provided at both ends of the paper guide plate 5 have appropriate curvatures at the bent portions. A given L-shaped notch 12' is provided.

One side at the back of the L-shape is provided approximately perpendicular to the surface of the paper guide plate, and one side having the closed opening is approximately perpendicular thereto. The support shaft 9 that supports the feed roller support arm 4 with the feed rollers 2 and 3 attached to the notch 12' is inserted into the notch 12' and supports the paper guide plate 5 at the toe of the notch 12'. .
Similar to the conventional device, the rear end of the paper guide plate 5 is pulled rearward by a spring 6 which is tensioned almost horizontally between the frame 7 of the printer and the paper guide plate 5 is held in position.

In this embodiment, the support shaft 9 is fixed to the tip of a holding arm 8 having a leaf spring structure and supported by a shaft 10. Since the paper guide plate holding structure of the present invention is constructed as described above, the feed roller 2,
When the releasing operation of 3 is performed, as shown in FIG. It makes a circular motion and applies an impact force to the support point of the paper guide plate 5 in the direction of its tangential line (the direction indicated by arrow A in FIG. 8).

Since this direction almost coincides with the direction of the vertical part of the notch 12, the toe of the notch 12' momentarily separates from the support shaft 9, and the paper guide plate 5 jumps up, but the support shaft 9 immediately Since it hits the lower green of the bent part of the notch 12', the paper guide plate 5 will not jump any further and come off the support shaft 9 as in the conventional case. However, if it becomes necessary to remove the paper guide plate 5, first hold the paper guide plate 5 in your hand and
If the notch 12' is moved in the direction of arrow B after being raised in the direction shown in FIG.

When installing, the normal holding state can be easily obtained by forcing the support shaft 9 to close the notch 12' and moving the paper guide plate in the opposite direction to the above. In the above embodiment, the shape of the notch is L-shaped with an appropriate curvature at the bent part, but the bottom of the L may be oriented as shown in FIG. 9, with the bottom facing in the opposite direction from FIG. 7. do not have.

Furthermore, it goes without saying that the same effects as those of the above embodiment can be obtained by using a lightning bolt shape as shown in FIG. 10 or an acute angle shape as shown in FIG. 11. As described above, according to the present invention, the shape of the notch in which the support shaft of the placket provided at both ends of the paper guide plate is inserted and supported is changed from the conventional linear shape to a shape with a bent part. This simple structure allows the paper guide plate to be easily removed and attached by hand when necessary, and also prevents the paper guide plate from unexpectedly coming off the support shaft due to impact. This eliminates the trouble of setting the paper guide plate, which is currently necessary in the case of the conventional holding structure, and at the same time encourages accurate setting of the paper guide plate, and prevents the paper feeding function caused by incorrect setting of the paper guide plate. This has the effect of preventing damage to related parts and paper.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of the paper guide plate holding structure of a conventional printer; Fig. 2 is a perspective view showing the structure of the end portion thereof;
The figure is a side view showing the shape of the notch for inserting the support shaft of the paper guide plate, Figure 4 is a diagram showing the paper guide plate coming off the support shaft due to impact, and Figure 5 is the invention of the present invention. 6 is a perspective view of the end of the structure, FIG. 7 is a side view showing the shape of the notch, and FIG. 8 is a side view showing the effect when an impact is applied. The explanatory drawings shown in FIGS. 9 to 11 are side views showing different embodiments. 1...Platen, 2, 3...Feed loaf, 6...Spring, 7...Printer frame, 8...
Feed roller holding arm, 9... Paper guide plate support shaft, 11...Bracket, 12...Notch. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. Insert and hold the shaft provided on the holding member of the feed roller that can freely move toward and away from the platen into the notch formed in the holding portion of the paper guide plate provided along the circumferential surface of the platen near the bottom of the platen. In addition, in the paper guide plate holding structure in which the rear end of the paper guide plate is held in position by applying an urging force that pulls it backward, the shaft insertion notch provided in the paper guide plate holding portion is attached to the paper guide plate. A first slideway that can slide while being regulated in direction by the position of the shaft even under the action of a force, and a first slideway that can slide on the shaft only by applying an external force to the paper guide plate that resists the biasing force. 1. A holding structure for a paper guide plate, characterized in that the holding structure includes a second slideway that is capable of moving the shaft and that communicates with an opening for detaching the shaft from the holding portion of the paper guide plate.