JPH11301902A - Tractor feeder - Google Patents

Abstract

(57) [Summary] [Problem] To provide a tractor feeder capable of reliably feeding continuous paper. SOLUTION: A tractor feeder 4A has a base 7A having a predetermined shape, and tooth portions 9 fixed to the base and having a predetermined pitch.
A driving wheel 8 having: a driven wheel 10 fixed to the base;
The sheet 13 is wound around the driving wheel 8 and the driven wheel 10 and
A belt 11 provided on the inner periphery with a pin 14 which engages with the tooth portion 9 of the driving wheel 8,
, A guide member 17A provided between a driving wheel and a driven wheel of the base and provided with a flat surface 17h that comes into contact with the inner peripheral surface of the belt 11, and a driving member fixed to the base. A hook 18 is provided to hold the wheel 8, the driven wheel 10, and the belt 11 on the base. Guide member 1
7A, on the side of the driven wheel 10, a surface 27 that gradually approaches the belt side with respect to the movement direction X of the belt 11 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor feeder used for a printer, which feeds a sheet while catching a pin in a hole of the sheet. More specifically, the present invention relates to a tractor feeder that prevents a sheet from being unable to be fed.

[0002]

2. Description of the Related Art As is well known, a printer of this type comprises a printing means for printing on paper, a mechanism for feeding paper, and other parts such as a control circuit and a power supply. Some of such printers use a tractor feeder to feed paper.

FIG. 7 is a perspective view of an example of a printer viewed from the rear side. The printer 1 shown in FIG. 1 includes a print head 2 that prints on paper, a platen 3 that feeds and prints the paper, and a tractor feeder 4 that feeds the paper.
And other parts such as a control circuit and a power supply. This tractor feeder 4 has two parallel axes 5, 6
, And receives rotational driving force from one of the shafts 5.

FIG. 8 is a side view showing the conventional tractor feeder. FIG. 9 is a side view showing a main part of the tractor feeder. In these figures, the tractor
The feeder 4 has the following configuration. That is, a driving wheel 8 is rotatably provided on the base 7 having a predetermined shape, and the driving wheel 8 receives a driving force from the shaft 5. On the outer periphery of the drive wheel 8,
A tooth portion 9 having a predetermined pitch is provided. A driven wheel 10 is rotatably provided on the base 7. A belt 11 is stretched between the driving wheel 8 and the driven wheel 10. On the outer periphery of the belt 11, there are provided pins 14 which are engaged with feed holes 13 of the continuous paper 12, and on the inner periphery of the belt 11, teeth 15 having a pitch meshing with the teeth 9 of the driving wheels 8.
Are provided over the entire width in the lateral direction (width direction) of the belt.

[0005] Further, the cover 1
6 are provided, and the cover 1
2 is pressed toward the belt 11. A guide member 17 is provided between the drive wheel 8 and the driven wheel 10 of the base 7. The guide member 17 has a flat surface 17h with which the teeth 15 on the inner peripheral surface of the belt 11 come into contact, and the flat surface 17h prevents the belt 11 from dropping. Further, by fixing a hooking member 18 to the base 7 provided with the driving wheel 8, the driven wheel 10, and the belt 11, these members are hooked to the base 7.

In the printer 1 having the tractor feeder 4 having such a structure, the continuous paper 12 is hooked on the pin 14 of the tractor feeder 4 of the printer 1 through the hole 13 of the paper and passes through the platen 3 of the printer 1. Then, it is printed by the print head 2 or sent out of the printer 1 without being printed.

[0007]

In the case of the tractor feeder 4 described above, the belt 11 is pushed down as shown by an arrow F in FIG. There is a problem in that the tooth portion 15 of the belt 11 hits the protrusion 17p of the guide member 17 and is caught, so that the belt 11 is locked and paper feeding cannot be performed.

In order to solve this problem, the guide member 17 may be eliminated, or the tooth portion 15 of the belt 11 may be removed.
When the distance between the belt 11 and the flat surface 17h of the guide member 17 is increased, the belt 11 is pushed, the pins 14 of the belt 11 come off from the feed holes 13 of the continuous paper 12, and the continuous paper 12 cannot be fed. was there.

An object of the present invention is to provide a tractor feeder which solves the above-mentioned problems of the prior art and can reliably feed continuous paper.

[0010]

To achieve the above object, a tractor feeder according to the first aspect of the present invention comprises:
A base body having a predetermined shape, a drive wheel rotatably provided on the base body and having teeth at a predetermined pitch, a driven wheel rotatably provided on the base body, and hung on the drive wheel and the driven wheel; A belt provided on the outer periphery with pins that are passed and hooked on holes of the paper, teeth provided on the inner circumference to engage with the teeth of the drive wheels, a cover body for pressing the paper toward the belt, and the driving of the base. A tractor feeder including a guide member provided between a wheel and the driven wheel and provided with a flat surface that comes into contact with an inner peripheral surface of the belt, wherein the guide member includes the belt at least on the driven wheel side. The surface is formed so as to gradually approach the belt side with respect to the moving direction.

According to the first aspect of the present invention, the guide member is formed with a surface that gradually approaches the belt in the traveling direction of the belt, and there is no portion where the teeth of the belt collide and are caught. The paper can be reliably fed without the occurrence of belt lock.

Further, since the teeth on the inner circumference of the belt slide without catching on the flat portion of the guide member,
Even if the belt is pushed, the belt does not bend, the pins of the belt do not come off from the paper feed hole, and the paper can be fed reliably.

According to a second aspect of the present invention, in the first aspect of the present invention, a surface formed on at least one of the drive wheel and the driven wheel of the guide member is moved in a direction in which the belt moves. Is a slope gradually approaching the belt side. According to the present invention, the portion of the guide member that could lock the belt is a slope, so that the tooth portion of the belt does not get caught and can be easily formed because it is a slope. .

[0014] The invention described in claim 3 of the present application is directed to claim 1.
In the invention described in the above, a surface formed on at least one side of the drive wheel and the driven wheel of the guide member,
The circumferential surface gradually approaches the belt side with respect to the moving direction of the belt. According to the present invention, since the portion of the guide member that could lock the belt is a circumferential surface, the teeth of the belt are less likely to be caught.

According to a fourth aspect of the present invention, there is provided a tractor feeder having a base having a predetermined shape, a drive wheel rotatably provided on the base and having teeth at a predetermined pitch, and A driven wheel, which is provided so as to be capable of being driven, and a belt which is wound around the driving wheel and the driven wheel, and which has a pin which is hooked on a hole of a sheet on an outer periphery, and a tooth portion which meshes with a tooth portion of a precursor driving wheel is provided on an inner periphery. A tractor comprising: a cover member for pressing a sheet toward the belt side; and a guide member provided between the drive wheel and the driven wheel of the base and having a flat surface that comes into contact with the inner peripheral surface of the belt. In the feeder,
The guide member has a surface gradually approaching the belt side and a surface gradually moving away from the belt side with respect to the driving wheel side in the movement direction of the belt, and the driven wheel side with respect to the movement direction of the belt. A surface gradually approaching to the belt side and a surface gradually approaching from the belt side are formed, respectively.

According to the fourth aspect of the invention, in addition to the same operation and effect as the first aspect of the invention, the shape of the surface facing the drive wheel and the driven wheel is formed linearly. Therefore, it is possible to assemble without worrying about the moving direction of the belt. Belt lock can be sufficiently prevented.

Further, the invention described in claim 5 of the present application is directed to claim 4
In the invention described in the above, the surface formed on the side of the drive wheel and the driven wheel of the guide member is gradually inclined toward the belt side with respect to the movement direction of the belt, and is gradually separated from the belt side. And a slope is formed. According to the present invention, since a portion of the guide member on the side of the drive wheel and the driven wheel that may lock the belt is formed on a line-symmetric slope, the tooth portion of the belt is not caught. And since it is a slope, it can be easily formed, and since the shape is formed in line symmetry, there is no need to worry about the traveling direction of the belt.

Further, the invention described in claim 6 of the present application is directed to claim 4
In the invention described in the above, the surface formed on the side of the drive wheel and the driven wheel of the guide member, from the circumferential surface and the belt side gradually approaching the belt side with respect to the movement direction of the belt And a circumferential surface that gradually moves away. According to the present invention, since the portion of the guide member on the side of the drive wheel and the driven wheel that could lock the belt is formed on the circumferential surface which is symmetrical with the line, the tooth portion of the belt is caught. There is no need to worry about the traveling direction of the belt since the shape is formed line-symmetrically.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 are views for explaining a tractor feeder according to the first embodiment of the present invention. Here, FIG. 1 is a perspective view showing a tractor feeder according to the first embodiment. FIG. 2 is a perspective view showing a state in which the hook and the cover are removed from the base in the first embodiment. FIG. 3 is an enlarged sectional view taken along line AA of FIG. FIG. 4 is an exploded perspective view of the first embodiment. FIG. 5 is a side view showing a main part of the first embodiment.

The difference between the tractor feeder 4A according to the embodiment shown in these figures and the conventional tractor feeder 4 is that the shape of the guide member 17A is not locked by the belt 11, and the belt 11 is The point is that it is formed in a shape that does not bend. Therefore, the same components as those of the conventional tractor feeder 4 will be described with the same reference numerals. The tractor feeder 4A according to the present embodiment is configured as follows.

That is, the base 7A is formed of a plate 20 made of a material such as plastic, and a paper sliding surface 21 formed at one end of the plate 20 at right angles to the plate 20. A drive bearing 22 is provided on the plate body 20, and a hollow cylindrical driven shaft 23 is integrally formed at a position on the plate body 20 at a predetermined distance from the bearing 22. Further, a guide member 17A is provided by integral molding between the drive bearing 22 and the driven shaft 23 of the base 7A. The guide member 17A is provided with a screw hole 24, and positioning holes 25 and 26 are provided above and below the screw hole 24 in the drawing.

On the drive wheel 8 side of the guide member 17A,
As shown in FIG. 5, a slope 27 that gradually approaches the belt 11 side in the movement direction X of the belt 11 and a slope 28 that gradually goes away from the belt 11 side are formed. On the driven wheel 10 side of the guide member 17A, a slope 29 gradually approaching the belt 11 side with respect to the movement direction X of the belt 11 and a slope 30 gradually approaching from the belt 11 side are formed. .

The driving wheel 8 comprises a rotating body 31 provided with the teeth 9 and driving shafts 32 provided on both sides of the rotating body 31. The driving shaft 32 has a rectangular hole. Hr is drilled. One of the drive shafts 32
It is rotatably fitted into the drive bearing 22 of the base 7A.
The driven wheel 10 is formed in an annular shape, and the driven wheel 10 is rotatably fitted to a driven shaft 23 of the base 7A. A belt 11 is stretched between the driving wheel 8 and the driven wheel 10.

The hanging member 18 is formed in a plate 50 having a predetermined shape using a material such as plastic.
0 is provided with a projection (not shown) that fits into the positioning holes 25 and 26 of the base 7A.
0, a driven bearing 33 into which the driven shaft 23 is inserted, an engagement hole 35 into which an engagement screw 34 is inserted, and a drive bearing 38 into which the drive shaft 32 of the drive wheel 8 is inserted. On the other surface of the plate body 50 of the hook body 18, an engagement bearing 37 with which the engagement shaft 36 of the cover body 16 is engaged is provided. The engaging projection for positioning the hook 18 is attached to the base 7A.
Of the guide member 17A, the driven shaft 23 of the driven bearing 33, the drive shaft 32 of the drive wheel 8 in the drive bearing 38, and the screw 34 inserted from the engagement hole 35. Then, the hook body 18 is fixed to the base 7A by screwing into the screw hole 24 of the guide member 17A.

The engaging shaft 36 of the cover 16 is engaged with the drive bearing 37 of the hook 18 so that the cover 1
6 can be tilted to the paper sliding surface 21 side or raised.

As described above, the tractor of the first embodiment
Since the feeder 4A has the slopes 28,..., 30 formed in the portion where the teeth 15 of the belt 11 are locked, the paper can be reliably fed without the occurrence of the belt lock.

Further, according to the first embodiment, the teeth 15 on the inner periphery of the belt 11 slide without catching on the flat portion 17h of the guide member 17A.
Even if the belt 11 is pushed, the belt 11 does not bend,
The pin 14 of the belt 11 is connected to the feed hole 13 of the continuous paper 12.
The paper can be reliably sent without falling off.

Further, in the first embodiment, the portion where the teeth 15 of the belt 11 are locked is a simple slope 2.
, 30, this guide member 1
7A is easy to manufacture in terms of manufacturing, and since the inclined surfaces 28,..., 30 are formed on the driving wheel 8 and the driven wheel 10, respectively, the belt lock can be achieved even if the driving direction of the belt 11 is changed. It can be prevented from occurring.

FIG. 6 is a diagram showing a second embodiment of the present invention. The tractor feeder 4B according to the second embodiment shown in FIG. 6 differs from the tractor feeder 4A according to the first embodiment in the shape of a guide member 17B. That is, in the first embodiment, the slopes 28,..., 30 are provided on the guide member 17A of the base 7A, whereas in the second embodiment, the guide members 17A are provided.
A, instead of the slopes 28,..., 30 provided on the belt 11, the surface formed on the drive wheel 8 and the driven wheel 10 side of the guide member 17B with respect to the movement direction Y of the belt 11, The circumferential surfaces 40 and 41 gradually approaching the belt 11 and the circumferential surfaces 42 and 43 gradually moving away from the belt 11 side,
The other components are the same as those of the first embodiment. Therefore, in the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. According to the second embodiment, the same operation and effect as those of the first embodiment can be obtained.

The first embodiment or the second embodiment
In the embodiment, further, on the inner peripheral surface of the belt,
In the cross-section of the belt, and at the center of the belt provided with a trapezoidal tooth portion that narrows as the distance from the belt substantially increases,
Guide grooves are formed in the guide members 17A and 17B so that the trapezoidal teeth are fitted therein.
A tractor feeder (shown in the drawings) according to the third embodiment in which the teeth of the belt are fitted into the guide grooves, and flat portions on both sides of the teeth of the belt slide on both end surfaces of the guide grooves. Z)
According to this, for example, even if a thick continuous sheet enters or a perforated portion of the continuous sheet enters, the guide member 17
Since the guide grooves are formed in A and 17B and there is no member that comes into contact with the teeth of the belt, belt lock does not occur and the paper can be fed reliably.

In the tractor feeder according to the third embodiment, since the flat portions on both sides of the teeth of the belt slide on both end surfaces of the guide grooves of the guide members 17A and 17B. Thus, the paper can be reliably fed without the pins of the belt coming out of the holes of the continuous paper.

[0032]

As described above, according to the present invention, the guide member is formed with a surface which gradually approaches the belt in the traveling direction of the belt, and there is no portion where the teeth of the belt collide. Thus, the paper can be fed reliably without the occurrence of belt lock.

Further, according to the present invention, since the teeth on the inner periphery of the belt slide on the flat portion of the guide member, the belt does not bend even when the belt is pushed, and the belt is not bent. The paper can be fed reliably without the pins coming off the paper feed holes.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tractor feeder according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a hook and a cover are removed from a base in the first embodiment.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 1;

FIG. 4 is an exploded perspective view of the first embodiment.

FIG. 5 is a side view showing a main part of the first embodiment.

FIG. 6 is a diagram showing a second embodiment of the present invention.

FIG. 7 is a perspective view showing a printer.

FIG. 8 is a side view showing a configuration example of a conventional tractor feeder.

FIG. 9 is a diagram for explaining a drawback of a conventional tractor feeder.

[Explanation of symbols]

 4A, 4B Tractor feeder 7A Base 8 Drive wheel 9 Tooth portion 10 Follower wheel 11 Belt 12 Continuous paper 13 Hole 14 Pin 15 Tooth portion 16 Cover body 17A, 17B Guide member 27, 28, 29, 30 Slope 40, 41, 42 , 43 circumference

Claims (6)

[Claims] 1. A base having a predetermined shape, a drive wheel rotatably provided on the base and having teeth at a predetermined pitch, a driven wheel rotatably provided on the base, and the drive wheel. A belt provided on the outer periphery of which a pin which is hung over the driven wheel and which is caught in a hole of the paper, a toothed portion which meshes with a toothed portion of the drive wheel, and a cover body which presses the paper toward the belt side; A tractor feeder including a guide member provided between the drive wheel and the driven wheel of the base and having a flat surface that comes into contact with an inner peripheral surface of the belt, wherein the guide member is provided at least for the driven wheel. A tractor feeder characterized in that a surface is formed on the side of the tractor that gradually approaches the belt side with respect to the moving direction of the belt. 2. The device according to claim 1, wherein the surface formed on at least one of the driving wheel and the driven wheel of the guide member is a slope gradually approaching the belt side with respect to the moving direction of the belt. A tractor feeder characterized in that: 3. A surface according to claim 1, wherein said surface formed on at least one of said drive wheel and said driven wheel of said guide member gradually approaches a belt side with respect to a moving direction of said belt. A tractor feeder, characterized in that: 4. A base having a predetermined shape, a drive wheel rotatably provided on the base and having teeth at a predetermined pitch,
A driven wheel rotatably provided on the base, a pin that is hung over the drive wheel and the driven wheel, and a pin that is caught in a hole of a sheet is provided on an outer periphery, and a tooth portion that meshes with a tooth portion of a precursor drive wheel is provided on an inner periphery. A belt, a cover member for pressing paper toward the belt side, and a guide member provided between the drive wheel and the driven wheel of the base body and provided with a flat surface that comes into contact with the inner peripheral surface of the belt. In the tractor feeder provided, the guide member has, on the driven wheel side, a surface gradually approaching the belt side and a surface gradually moving away from the belt side in the moving direction of the belt toward the drive wheel side. A tractor feeder characterized by forming a surface gradually approaching the belt side and a surface gradually moving away from the belt side with respect to the moving direction of the belt. 5. The belt according to claim 4, wherein a surface formed on the side of the drive wheel and the driven wheel of the guide member includes a slope gradually approaching the belt side with respect to a moving direction of the belt and a belt side. A tractor feeder characterized in that a slope that gradually goes away is formed. 6. The belt according to claim 4, wherein a surface formed on the drive wheel and driven wheel side of the guide member has a circumferential surface gradually approaching the belt side with respect to a moving direction of the belt. A tractor feeder characterized in that a circumferential surface gradually moving away from the belt side is formed.