JPS6227408Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tractor feed device for a printer in which a member for guiding continuous paper is placed horizontally between left and right frames.

An example of a conventional tractor feed system is shown in FIG. In the same figure, 1, 1 is a frame, 2,
3 is a guide shaft that slidably supports a tractor feed mechanism (not shown), 4 is a platen interlocking mechanism that rotates the guide shaft 2 in conjunction with the rotation of the platen, 5 is a slack absorber, and 6 is a paper supply side guide bar. , 7 is a paper discharge side guide bar, and 8 and 9 are bar rotation stoppers. In this conventional device, the continuous paper is guided by the lower guide bar 6, engaged with the lower side of the tractor feed mechanism, wrapped around the platen, and then engaged with the upper side of the tractor feed mechanism. , the paper is then guided by the guide bar 7 and fed.

By the way, in this conventional device, each guide bar 6,
7 are independent, and bar rotation stoppers 8 and 9 are required to hold them in position, which requires a large number of parts and assembly man-hours.
There is a problem that increases costs.

For this reason, as in the conventional example shown in FIG.
The V-shaped bent portion 6 contacts the cover A of the printer.
A tractor feed device was proposed with a.

However, with this conventional device, each guide bar can be positioned using the cover A only when it is attached to the printer, but positioning is not possible in other cases. It is not practical because it is easily deformed and damaged.

The present invention was proposed under the above circumstances, and its purpose is to provide a simple structure and assembly that can be obtained at low cost, and to prevent the paper guide from inadvertently shaking. The purpose of the present invention is to provide a tractor feed device for a printer.

That is, in the present invention, a paper guide body that guides continuous paper is formed from a paper supply side guide part, a paper discharge side guide part that is longer than this guide part and is arranged above, and left and right fitting parts. In addition, the above-mentioned object of the present invention can be achieved by providing opposing guide support portions each consisting of a locking recess or a locking hole into which the fitting portion is fitted and locked in the pair of left and right frames. This is a tractor feed device for a printer characterized in that it is configured as follows.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

In the figure, 11 is a cylindrical platen installed in the printer, 12 is a paper guide, 13 is a petal-shaped printing wheel, 1
4 is a printer cover, and B is a continuous paper.

Next, a tractor feed device for feeding continuous paper B will be explained. In the figure, reference numerals 15 and 16 denote a pair of left and right frames, between which two mutually parallel guide shafts 17 and 18 are horizontally suspended, respectively. One guide shaft 17 has a square cross-section, and the other guide shaft 18 has a circular cross-section. A pair of left and right (only one shown) bidirectional tractor feed mechanisms 19 provided across these guide shafts 17 and 18 are supported so as to be movable along the axial direction. Since this mechanism 19 is conventionally known, it will not be explained here.
9a... indicates a feed pin. A platen interlocking mechanism 20 is attached to the outer surface of one of the frames, for example, the frame 16. This interlocking mechanism 20 includes a gear 21 that meshes with a drive gear (not shown) attached to the shaft 11a of the platen 11, another gear 22 that meshes with this gear 21, and this gear 22.
The drive pulley 23 is configured to rotate integrally with the drive pulley 23, a driven pulley 24 fixed to the guide shaft 17, and a timing belt 25 wrapped around these pulleys 23 and 24. Further, a pair of upper and lower guide support portions 26 and 27, each consisting of a locking recess, are formed at the rear upper portions of the left and right frames 15 and 16, respectively. Note that an arc-shaped introduction surface 28 that is continuous with the support section 27 is formed on the upper rear side of the lower guide support section 27 . A paper guide body 29 for guiding the strip-shaped paper B is horizontally suspended between the left and right frames 15 and 16. The paper guide body 29 is made of wire, and includes a paper supply side guide section 30 and a paper discharge side guide section 3 that is longer than the guide section 30 and is arranged above.
1, and left and right fitting parts 32, 32. The paper guide 29 is horizontally suspended between the left and right frames 15 and 16 by fitting and locking the left and right fitting parts 32 and 32 into the guide support parts 26 and 27, respectively. In addition, 33 in the figure is a slack absorber for the belt-shaped paper B, which is made rotatable so that the left and right frames 1
It is suspended horizontally between 5 and 16. Furthermore, 34 in the figure
1 is a cutout groove provided at the lower front end portions of the left and right frames 15, 16, which is adapted to be removably fitted onto the shaft 11a of the platen 11.

In this embodiment, the paper guide body 29 can be easily attached to the left and right frames 15, 16 by moving from the position shown by the solid line in FIG. 6 to the position shown by the two-dot chain line. That is, first, the paper guide 29 is placed in a vertical position, and the first locking portions 32a, 32a in the fitting portions 32, 32 are connected to the upper guide support portions 26, 32, respectively.
6 and lock it. Next, the paper guide body 29 is rotated in the direction of arrow C in FIG. Then, the second locking parts 32b, 32 in the fitting parts 32, 32
b slides on the introduction surface 28, respectively, and then is resiliently locked to the lower guide support portions 27, 27. In this way, the paper guide body 29 is connected to the upper and lower guide body support parts 26,
27, and the left and right frames 15, 16 are placed in a state in which the respective guide portions 30, 31 are approximately horizontal.
It is suspended horizontally in between.

In addition, in this embodiment, as shown in FIG. 7, a stopper projection 28a is provided at the end of the introduction surface 28, and the distance D from the lower end to the stopper projection 28a is the same as the distance D from the lower end of the upper guide support portion 26 to the stopper projection 28a. The relationship between the distance E to the upper end of the support part 27 is D>
It may be set as E. In the case of this modification, the stopper protrusion 28a can more reliably prevent the second locking part 32b from coming off from the lower guide support part 27, and in this case, the second locking part 32b is not necessarily connected to the support part 27. It is not necessary to lock the bullet.

Furthermore, the present invention may be implemented as another embodiment shown in FIG. In this embodiment, the guide support part 3
The structure is the same as that of the above-mentioned embodiment except that 5 and 35 are elongated locking holes, and the introduction surface 28 is omitted. In this embodiment, when connecting the left and right frames 15, 16, the guide support parts 35, 3
5, the left and right fitting parts 32, 32 are fitted and locked, and the paper guide body 29 is attached, or the left and right frames 15, 16 are attached by using the elasticity of the paper guide body 29.
After the paper guide 29 is connected, the left and right fitting parts 32, 32 are fitted and locked into the guide support parts 35, 35, and the paper guide 29 is attached.

Although each of the above-mentioned embodiments is constructed as described above, in carrying out the present invention, the frame, the guide support part, the paper guide part, the paper supply side guide part, It goes without saying that the specific structure, shape, position, etc. of the paper ejection side guide section, the fitting section, etc. are not limited to those of the above-mentioned embodiments, and can be configured and implemented in various ways.

The present invention described above has the following effects because it is based on the claims of the above-mentioned utility model registration.

Since the paper guide body that guides the continuous paper is formed from a paper supply side guide section, a paper discharge side guide section that is longer than this guide section and is arranged above, and left and right fitting sections, The paper guide can also be treated as a component. Since the pair of left and right frames are respectively provided with guide body support parts that are opposite to each other and consist of locking recesses or locking holes into which the fitting parts are fitted and locked, the fitting parts to the guide body support parts are provided opposite to each other. By fitting and locking, it is possible to prevent the paper guide from being inadvertently shaken in the vertical direction, and no special parts are required to stop the paper guide from moving. Therefore, for these reasons, the number of parts is reduced compared to the conventional one, the structure becomes simpler, and the number of assembly steps can be reduced, and as a result, it can be obtained at low cost.

As described above, by fitting and locking the fitting part into the guide support part, it is possible to prevent the paper guide from being inadvertently shaken in the vertical direction when carrying the paper guide. It is possible to prevent deformation and damage to the paper guide body, etc., and also facilitate handling when carrying the paper guide.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views showing different conventional examples. Figures 3 to 6 show an embodiment of the present invention, with Figure 3 being a vertical side view, Figure 4 being a perspective view, Figure 5 being an exploded perspective view of the main parts, and Figure 6 being a paper guide. It is a side view for explaining attachment. FIG. 7 is a side view showing a modified example of the guide mounting portion, and FIG. 8 is an exploded perspective view of the main parts showing another embodiment of the present invention. 15, 16... frame, 26, 27, 35...
...Guide support section, 29...Paper guide, 30...
Paper supply side guide section, 31...Paper discharge side guide section,
32...Left and right inset parts, B...Continuous paper.

Claims (1)

[Scope of utility model registration request] A pair of left and right frames, a guide support section consisting of a locking recess or a locking hole provided oppositely to these frames, a paper supply side guide section, and a guide section that is longer than and arranged above the guide section. It is formed with a paper ejection side guide part and left and right fitting parts,
A tractor feed device for a printer comprising a sheet guide body which is horizontally suspended between left and right frames by fitting and locking these fitting portions into the guide bar support portion.