JPH028779Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a paper feeding device such as a printer that can use both letter paper and fanfold paper having sprocket holes.

Conventional structure and its problems As one of the paper feeding devices of printers in recent years,
There are devices that use fanfold paper with sprocket holes. In order to be able to use letter paper (without sprocket holes) in such an apparatus, it is necessary to place the paper feeding tractor far away from the insertion slot, as shown in FIG.

Hereinafter, a conventional paper feeding device for a printer will be explained with reference to FIG.

In FIG. 1, reference numeral 1 denotes a tractor for feeding fanfold paper (indicated by a dashed line) having sprocket holes, and has a guide shaft 2 and a drive shaft 3. By driving this drive shaft 3, the fanfold paper is fed. 4 is a platen around which the paper is wound; 5 and 6 are platens 4
A guide roller 7 presses the paper against the paper, and 7 is a printing section that prints on the paper.

The above-described apparatus can also print on letter paper without using fanfold paper having sprocket holes. That is, as shown in FIG. 1, by inserting the letter paper 8 through the insertion opening A and winding it around the platen 4, printing becomes possible.

In order to facilitate the insertion of the letter paper 8, in the above-mentioned apparatus, the tractor 1 is provided largely above the insertion opening A so that the tractor 1 does not interfere with the insertion. However, since the tractor 1 is provided above, there is a drawback that the entire device becomes large.

Therefore, as shown in FIG. 2, a tractor is placed on the side of the platen and opposite the platen, and the letter paper 8 can be inserted into the platen from above from between the tractor and the platen. A possible example is a paper feeding device configured as follows.

Hereinafter, a paper feeding device that eliminates the above drawbacks will be explained with reference to FIG.

In Fig. 2, 1 is a tractor, 2 is a guide shaft, 3 is a drive shaft, 4 is a platen, 5,
6 is a guide roller, and 7 is a printing section, which has the same structure as that shown in FIG. 1. The configuration differs from that shown in FIG. 1 in that the tractor 1 is provided inside the paper feeding device and a guide plate 9 for letter paper 8 is provided along the platen 4.

According to the above configuration, since the tractor 1 is installed inside the device, the overall size of the device can be reduced, but a new guide plate 9 must be provided in the assembly process during manufacturing, and The disadvantage is that the number of steps increases.

Purpose of the invention In order to downsize the entire device, the present invention places a tractor at a position opposite to the platen on the side of the platen, and from between the tractor and the platen,
The present invention provides a paper feeding device configured to allow letter paper to be inserted into the platen side from above, which is miniaturized and does not require an increase in the number of processing steps during manufacturing.

Structure of the Invention The present invention achieves the above object by forming a tractor facing the platen so as to follow the platen, and providing the tractor with a paper guide surface having no sprocket holes.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a partially cutaway side view of a paper feeding device in an embodiment of the present invention.

In FIG. 3, 2 is a guide shaft, 3 is a drive shaft, 4 is a platen, 5 and 6 are guide rollers, and 7 is a printing section, which is the same as the configuration shown in FIG. 2. The difference from the configuration shown in FIG. 2 is that the tractor 10 facing the platen 4 is shaped so as to follow the platen 4.

Next, a more detailed explanation will be given with reference to FIG.

FIG. 4 shows a plane of the tractor 10.

In FIG. 4, 11a and 11b are side guides provided along the platen 4, and are integrally molded as a tractor 10. 12,1
3 and 14 are guide means for the letter paper 8, and the side guide 1
1a and 11b, it has back guides 12a, 13a and 14a which are integrally molded as a tractor 10 along the platen 4, respectively.
In addition, 2 is a guide shaft, 3 is a drive shaft,
Reference numeral 15 denotes a paper feeding section which has a protrusion 15a that engages with a sprocket hole of the fanfold paper and feeds the fanfold paper by being driven in the direction of arrow X by the driving force of the drive shaft 3.

In the above configuration, when the letter paper 8 is inserted from the direction of the arrow B, the letter paper 8 is inserted along the tractor 10, that is, along the side guides 11a, 11b and the back guide 12 as shown in FIG.
It can be easily wound around the platen 4 along the lines a, 13a, and 14a.

As described above, according to this embodiment, the tractor 10
By making the shape of the tip of the device follow the platen 4, it is possible to achieve a smaller size compared to the device shown in FIG. 1, and there is no need to newly provide the guide plate 9 compared to the device shown in FIG. Therefore, the number of processing steps during manufacturing does not increase.

Effects of the invention As described above, the present invention realizes miniaturization of the apparatus by forming the shape of the tractor facing the platen so as to follow the platen, and by providing the tractor with a paper guide surface without sprocket holes. Moreover, due to this miniaturization, the number of processing steps during manufacturing does not increase, and its practical value is great.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of the main parts of a conventional paper feeding device.
Fig. 2 is a cutaway side view of a main part of a paper feeding device which is an improved version of the device shown in Fig. 1, Fig. 3 is a cutaway side view of a main part of a paper feeding device according to an embodiment of the present invention, and Fig. 4 is the same. FIG. 3 is a plan view of the tractor of the device; 4...platen, 10...tractor, 11a,
11b...Side guide, 12a, 13a, 14a...
...Back guide.

Claims (1)

[Scope of utility model registration request] The apparatus includes a platen for winding paper, and a paper feeding tractor provided on a side of the platen and facing the platen and having a sprocket hole, and having a sprocket hole between the tractor and the platen. forming an opening for inserting a blank sheet of paper into the platen side; a portion of the tractor facing the platen having a shape curved along the platen; A paper feeding device comprising a guide surface for guiding paper to the platen.