JPH0541019Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention aims to improve the retaining structure of the sheet holding plate in a sheet-feed tractor. This invention relates to a new mechanism that can effectively prevent damage, and can be widely used in computers, word processors, and printers.

[Prior art and problems to be solved]

Conventionally, in a tractor 9 of a printer such as a computer or a word processor, a timing belt 11 having a feed pin 10 is provided endlessly, and after the marginal oars 13 of the sheet 12 are fitted into the feed pin, the belt can be opened and closed in a hinged manner. The printing process was performed by holding the sheet by covering it with a sheet holding plate 1 supported by the sheet. In this case, a structure is adopted in which the printer is held open at an angle of approximately 100 degrees, which is slightly larger than the vertical direction, and the printer has a plastic cover 14 above the tractor that serves both as sheet guide and as dust protection. The cover is pivotally supported so as to be openable and closable, and this cover is configured to maintain a certain space between the seat 12 and the tractor when the seat 12 is placed on the timing belt 11 of the tractor 9 and the seat restraint plate 1 is closed. (See Figure 2).

However, if such a structure is adopted, the cover 14 may be closed due to a slight carelessness and the cover 14 is closed while the seat holding plate 1 is left open, resulting in damage to the cover or otherwise to the tractor's seat holding plate. It's easy to make mistakes.

The present invention is an attempt to solve the above-mentioned troubles in conventional printers.

[Means for trying to solve problems]

The present invention is characterized in that the locking structure of the seat restraining plate 1 in the open state is such that when an unreasonable force exceeding a certain pressure is applied, the locking portion is bent and the shock is released. .

That is, the gist of the present invention is achieved by using a cantilever-shaped flexible spring plate 6 disposed near the pivot portion 5 of the seat restraining plate which is pivotally supported to the knuckle portion 3 of the frame 2 of the tractor 9 so as to be openable and closable. The present invention resides in that when a force exceeding a certain pressure is applied to the sheet holding plate 1, the plate is bent and the abutting portion is disengaged.

[Examples and their effects]

Hereinafter, one embodiment of the present invention will be described based on the drawings. The reference numeral 9 in the figure is a tractor, and this tractor has a timing belt 1 having a feed pin 10.
1, and the frame 2 on the side of the belt is further provided with a pair of knuckle parts 3, to which a pivot part 5 of the sheet restraining plate 1 is rotatably fixed by a pivot 4. A hinged sheet restraining plate is provided on the timing 11 so as to be openable and closable.

Reference numeral 6 denotes a spring plate supported by the frame 2 in a cantilevered manner and extending toward the pivot portion. A projection 7 is provided slightly forward of the center of the plate. is adapted to come into contact with the rear end portion of the sheet holding plate 1. The abutment position between this protrusion 7 and the sheet holding plate 1 is
The opening is slightly wider than vertical (see Figure 2). Note that the projection 7 does not necessarily need to be provided at the rear end of the sheet restraining plate as shown in the drawings, but may be located at the side near the pivot portion. Also, as shown in Fig. 3, a so-called click structure may be used, in which a recess 7' is provided in the flexible plate without any protrusion, and the rear end protrusion 5' of the sheet holding plate is fitted into this recess. good. In the state shown in FIG. 2, if a vertical force is applied from above the sheet holding plate 1, the rear end of the sheet holding plate will force the plate 6 through the protrusion 7.
As shown by the dotted line, the sheet retaining plate 1 bends downward and disengages from the protrusion, so that the sheet holding plate 1 itself falls in the fully open direction (leftward in the figure). Therefore,
Even if the cover 14 is accidentally closed when the sheet holding plate 1 is open as shown in the drawing, the rear end of the sheet holding plate 1 will push down the plate 6 through the protrusion 7, and the sheet holding plate itself will not open. Since the cover 14 can easily fall down in the direction, not only the cover 14 but also the sheet holding plate 1 itself will not be damaged.

[Effects of this invention]

As described above, in the present invention, since the locking portion of the sheet restraining plate is supported by an elastic plate, neither the cover nor the sheet restraining plate will be damaged. Furthermore, since it is extremely simple in structure, it is inexpensive in terms of cost and has great practical value.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a partial perspective view of the tractor, FIG. 2 is an enlarged side view showing the relationship between the seat restraining plate and the locking protrusion, and FIG. 3 is a partial enlarged side view showing another embodiment. 1... Seat holding plate, 2... Frame,
3...Natsukuru part, 4...Axis, 5...Kinda branch,
6...Spring plate, 7...Protrusion, 9...
Tractor, 10...Feed pin, 11...Timing belt, 12...Seat, 13...Marginal hole, 14...Cover.

Claims (1)

[Scope of utility model registration request] In a sheet-feed tractor, a cantilever-like deflectable spring plate is arranged near a pivot point 5 of the seat restraining plate to engage the seat restraining plate 1 in an open state, which is pivotably supported on a knuckle portion of a frame so as to be openable and closable. A structure for preventing damage to a sheet holding plate in a sheet feed tractor as described in 6.