JPS5823650Y2 - Printer paper holding device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a paper holding device for a printer, and its purpose is to provide a reliable paper holding device that applies uniform pressure to the paper, and allows easy switching to release the paper holding. There is something to do.

2. Description of the Related Art In general, some printers that transport long sheets of paper for printing are provided with paper holding devices at predetermined locations on the paper travel path in order to smoothly guide and transport the paper.

As shown in FIG. 1, the conventional paper presser mechanism of this type has a paper presser 51 made of a wire bent into a substantially rectangular wave shape, installed on the travel path of the paper 50 conveyed by a bin tractor, rollers, etc. A coil spring 55 stretched between the bent portion 53 of the paper presser 51 whose both ends are pivotally supported by the body 52 and the support 54 of the frame body 52 biases the paper presser 51 with rotational force in the direction of the arrow. , the paper 50 is pressed down.

In addition, in the figure, 56 is a platen.

However, in the above configuration, variations in the coil springs 55 installed on both sides of the frame body 52 or paper presser 51
Due to twisting, deformation, etc. of the paper presser 51, the pressing force at each contact point with the paper 50 becomes uneven. Since the paper 50 must be put in and taken out while being held in the position, loading and unloading the paper 50 is troublesome.

In addition, when the width of the paper changes, there is a problem in that an equal pressing force is not applied to both sides when viewed from the center of the paper width, and a biased pressing force is applied to the paper 50.

The present invention has been developed in view of the above points, and its details will be explained below with reference to an embodiment shown in FIGS. 2 to 5.

Fig. 2 shows an outline of the paper feeding device of the printer. In the figure, a long paper 1 in roll form (or folded and stacked) is transported by a predetermined amount in the direction of the arrow by a bin tractor 2. At the portion wound around the platen 3, desired printing is performed by the print head 5 via the ink ribbon 4.

A paper pressing member generally indicated by the number P is installed between the platen 3 and the paper 1 supply source 1A.

6 is a paper guide board. The paper pressing member P holds the paper 1
The frames 7, 7 (of the printer) are perpendicular to the running path of the printer.
Two parallel guide rails (support frame) installed between 8
. It has become.

As shown in Figure 4.5, the paper feeding member P has a frame body 9 whose upper and lower sides are open. 10 are connected to each other by second side plates 11, 11 (partly not shown).

The first and second side plates 10 and 11 are assembled and fixed by screws 13.

The guide rail 8 is received within the bent portion 10a of the first side plate 10.

Reference numeral 14 denotes a cylindrical or cylindrical pressing body, which is connected and fixed to the substantially flat handle portion 16 by two struts 15 and 15 (parts not shown).

That is, the threaded part provided at one end of the pillar 15 is screwed and fastened into the screw hole on the upper part of the pressing body 14, and the threaded part provided at the other end of the pillar 15 is screwed and fastened.
For installation by inserting the handle part 16, screws 17 are screwed together and fastened, and the handle part 16, the support column 15, and the pressing body 14 are assembled into a solid body.

At all times, the pressing body 14 is in a downward position due to the weight of the three members 16, 15, and 14, and presses the paper 1 with a predetermined pressure.

18. 18 is a spring body made of a wire spring attached between the first side plates 10, 10, and bent portions 18 at both ends thereof.
a into the hole 10b of the first side plate 10 to remove the side plate 10.
installed on.

The spring body 18 is provided with a holding part 18b having a diameter that substantially matches the outer diameter of the annular groove 14a of the pressing body 14, and by pulling up the handle part 16, the pressing body The annular groove 14a of 14 is held by the holding part 18b to prevent the pressing body 14 from falling, and the pressing body 14 is held at an upper position separated from the paper 1.

Note that when the pressing body 14 is inserted into the holding portion 18b,
After the holding portion 18b is expanded, it returns to its original state, so
There is a click sensation when it is inserted.

Reference numeral 19 denotes an annular elastic washer fitted to the U-shaped curved protrusion 18C at the center of the spring body 18, which imparts appropriate elastic force and shape to the holding portion 18b.

Reference numeral 20 denotes a stopper plate for preventing the elastic washer 19 from coming off, and its protrusion 20a is connected to the first side plate 10.
It is inserted through the square hole 10C.

Reference numeral 16a denotes a notch formed in the handle portion 16, in which a curved protrusion 18C of the spring body 18 is located.

As is clear from the above configuration, when loading/unloading the paper 1 into the printer, the handle portion 16 is pulled up and the pressing body 14 is held in the upper position to load/unload the paper 1 and also to adjust the width of the paper. Correspondingly, the pressing body 14 (paper pressing member P) is moved along the guide rails 8, 8, and the pressing body 14 is moved along the guide rails 8, 8.
is adjusted and positioned to the center of the paper width.

As mentioned above, according to the present invention, the suppressor 14 can be positioned at the center position in the paper width direction in response to changes in the paper width, so there is no fear that biased pressing force will be applied to the paper 1. Since the force acting on the paper 1 is due to the weight of the pressing body 14, a stable pressing force can be maintained over time compared to the conventional method in which the pressing force is applied using spring pressure.

In addition, since the upper position of the pressing member 14 is held by the spring member 18, it is easy to take in and take out the paper 1, and a click feeling can be provided when switching between the upper position and the lower position of the pressing member 14. Furthermore, the operability becomes better.

Overall, it is possible to provide a paper holding device that applies a uniform pressing force to the paper and allows easy and reliable switching to release the paper holding, and has high practical value.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main part of a conventional example, FIGS. 2 to 5 are an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the paper feeding mechanism, and FIG. 3 is a perspective view of the main part. , FIG. 4 is a partially cutaway side view of the paper pressing member, and FIG. 5 is a partially cutaway front view of the same. P...Paper pressing member, 1...Paper, 8.
...Guide rail, 9...Frame, 14...
... Pressing body, 15 ... Support column, 16 ...
...Handle part, 18... Spring body.

Claims (1)

[Scope of utility model registration request] A guide rail is placed in the direction perpendicular to the paper travel path.
A frame body of the paper pressing member is slidably held, a handle portion and a pressing body connected to the handle portion are vertically movably disposed on the frame body, and a substantially inverted U-shape is attached to the frame body. The spring body is formed of a wire spring and has a holding part that holds the pressing body, and the paper is pressed by the weight of the pressing body, and the pressing body is held by the spring body at a position above the pressing body. Pnotar's paper pressing device is characterized in that the pressing body is maintained at an upper position.