JPH0435321Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a paper feeding mechanism for continuous paper with sprocket holes used as a printing medium in a printer.

(Prior art) Figure 9 shows a conventional paper feed mechanism (USP4194660)
FIG. This is because when the printer operates and the rectangular drive member 44 rotates in the direction of arrow E,
It is integrated with the square hole 81 of the gear 78 to drive the gear 78. Then tooth 79 becomes endless belt 87
The endless belt 8 meshes with the inner teeth 88 of the endless belt 8.
Drive 7. The gear 84 rotates when the inner teeth 88 of the endless belt 87 and the teeth 85 of the gear 84 mesh with each other, and the endless belt 87 is rotated by the gear 78.
The tension is driven in cooperation with the Here, the difference between gear 78 and gear 84 is that the shaft hole is a square hole or a round hole. gear 78
The gear 84 rotates integrally with the square member 44, but the gear 84 having a round hole is restricted from moving in the radial direction with respect to the round member 45, but is free to rotate. Furthermore, as long as the square timber serving as the driving member is attached to either side, it is free to place it in either the front or rear position. A plurality of spaced apart pin members 90 of the endless belt 87 are connected to the continuous paper 4 with sprocket holes.
It meshes with the sprocket hole 43 of No. 2. Paper presser 9
6 holds the continuous paper 42 with sprocket holes on the endless belt 87, and
2 sprocket hole 43 and endless belt 87
The engagement with the upper pin member 90 is prevented from becoming disengaged. In this way, the continuous paper with sprocket holes 4
2 is sent in the direction of arrow F.

However, the endless belt 87 is an integral part of the inner teeth 88, the band member 91, and the outer pin member 90, and is made of an elastic body formed into a perfect circle. On the other hand, the paper feeding mechanism requires a straight path portion in the endless belt 87 so that the continuous paper 42 with sprocket holes can be smoothly fed, and thus functions to deform the belt into an oval shape. Furthermore, a guide plate 55 is formed below this straight path portion to support this straight path portion. Here, holding walls 53, 54, 71 are attached to the tractor frames 51, 69 in order to press both edges of the semicircular parts on both sides of the oval-shaped endless belt 87.
72 are provided.

Furthermore, for assembly, the gear 78 is first inserted into the boss portion 60 of the tractor frame 51. Similarly, the gear 84 is inserted into the boss portion 62 of the tractor frame 51.
The inner teeth 88 of the endless belt 87 are engaged with the teeth 79 of the gear 78 and the teeth 85 of the gear 84, and the endless belt 87 is made to run along the outer surfaces of the guide plates 55 and 56. Next, insert the hole 76 of the tractor frame 69 into the boss portion 80 of the gear 78, and
8. Press the endless belt 87 with the frame surface 70. At the same time, the hole 77 of the tractor frame 69 is inserted into the boss portion 63 of the gear 84, and the gear 84 and the endless belt 87 are held down by the frame surface 70. Furthermore, align the hole 58 of the tractor frame 51 with the hole 74 of the tractor frame 69, and tighten with the screw 20.
The tractor frame 51 and tractor frame 69 are fastened together. The paper presser 96 covers the grooves 97 and 98 with the convex portions 65 and 67 of the tractor frame 51. The shafts 101, 103 are press-fitted by using the holes 99, 100 and the holes 66, 68 as through holes.

The tractor assembly is now assembled. Finally, the square-shaped drive member 44 is connected to the gear 78.
and the round member 45 through the round hole 86 on the gear 84 side.

(Problems to be Solved by the Invention) However, the conventional paper feeding mechanism having the above structure has the following problems.

Conventionally, the endless belt 87 of this type of paper feeding mechanism is made of an elastic body formed into a perfect circle, and is made up of an integrated inner tooth 88, a band member 91, and an outer pin member 90. On the other hand, the paper feeding mechanism described above requires a straight path portion in the endless belt 87 in order to smoothly feed the continuous paper 42 with sprocket holes, and therefore functions to transform the belt into an oval shape. Further, a guide plate 55 is formed below this straight path portion to support this straight path portion. Here, the holding walls 53, 54, 71, 7 of the tractor frames 51, 69
2 presses both edges of the semicircular portions on both sides of the oval-shaped endless belt 87. However, since the endless belt 87 is formed into a perfect circle, an elastic force acts to return the unpressed straight path portion to a perfect circle, and the endless belt 87 rises from the guide plate 55.
This lifting causes a paper jam.

Furthermore, in order to make the endless belt 87 lie along the guide plate 55 in a straight line, it is conceivable to set the distance between the gears 78 and 84 wide to increase the tension. However, this method has the disadvantage that the driving load on the endless belt 36 increases. Therefore, the present invention aims to solve the above problems.

(Means for Solving the Problems) The present invention includes a belt drive means including a set of tractor frames attached to a drive member, a set of gears rotated by the drive member, and a In a sheet feeding mechanism that is mounted and has a flexible endless belt that is integrated with inner teeth, a band member, and an outer pin member, a projection member that projects perpendicularly from both sides or one side of the flexible endless belt; A groove for restraining and guiding the protruding member is provided on the side surface of the set of tractor frames.

(Function) The protruding members vertically protruding from both sides or one side of the endless belt are restrained and guided by the grooves on the side of the tractor frame. Therefore, the force that tends to return the straight path portion of the endless belt to a perfect circle is suppressed, so that the straight path portion is held straight even during rotation of the endless belt.
Therefore, since the continuous paper with sprocket holes has a plurality of spaced apart pin members inserted into the sprocket holes and rests on the linear path portion of the endless belt, the paper can be fed smoothly.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of the first embodiment of the present invention, FIG. 2 is a perspective view of the tractor frame 12 in FIG. 1, and FIG. 3 is a sectional view taken along the line C-C in FIG. be. When the printer operates and the rectangular drive member 44 rotates in the direction of arrow E, it unites with the rectangular hole 24 of the gear 21 to drive the gear 21.
Then, the tooth 22 becomes the inner tooth 3 of the endless belt 31.
2 and drives the endless belt 31. The gear 26 rotates when the inner teeth 32 of the endless belt 31 and the teeth 27 of the gear 26 mesh with each other, and the endless belt 31 is stretched and driven in cooperation with the gear 21. The difference between gear 21 and gear 26 is that the shaft hole is a square hole or a round hole. The gear 21 rotates integrally with the drive member 44, and the gear 21 has a round hole.
6 is restricted from moving in the radial direction with respect to the round member 45, but is free to rotate. Furthermore, as long as the square timber serving as the driving member is attached to either side, it is free to place it in either the front or rear position. A plurality of spaced apart pin members 34 of the endless belt 31 engage with sprocket holes 43 of the continuous paper 42 with sprocket holes. The paper presser 32 holds the continuous paper 42 with sprocket holes on the endless belt 31 so that the sprocket holes 43 of the continuous paper 42 with sprocket holes and the pin members 34 on the endless belt 31 do not become disengaged. In this way, the continuous paper 42 with sprocket holes is fed in the direction of arrow F.

Here, the endless belt 31 has inner teeth 32,
It is an integral part of the band member 33 and the outer pin member 34, and is made of an elastic body formed into a perfect circle. On the other hand, the paper feeding mechanism requires the linear path portion 36 of the endless belt 31 to smoothly feed the continuous paper 42 with sprocket holes, and therefore functions to deform the belt into an oval shape. That is, the inner teeth 3 of the endless belt 31
2 are meshed with the teeth 22 of the gear 21 and the teeth 27 of the gear 26, and the endless belt 31 is made to run along the outer surfaces of the guide plates 4 and 5. Furthermore, in this invention,
A plurality of protruding members 35 protruding perpendicularly from both sides or one side of the endless belt 31 form oval-shaped ring grooves 3 on the tractor frame surfaces 1 and 12;
14 and is restrained and guided. Therefore, the force that tends to return the linear path portion 36 of the endless belt 31 to a perfect circle is suppressed, so that the linear path portion 36 of the endless belt 31 is held straight even during rotational operation. Therefore, the continuous paper 42 with sprocket holes has a plurality of spaced apart pin members 34 in the sprocket holes 43.
Since the paper is inserted and rests on the straight path portion 36 on the endless belt 31, the paper is fed smoothly.

For assembly, the boss portion of the gear 21 is inserted into the hole of the tractor frame 1, and the frame surface 2 and the end surface of the gear 21 are aligned. Similarly, the boss portion of the gear 26 is inserted into the hole of the tractor frame 1, and the frame surface 2 and the end surface of the gear 26 are aligned.

Next, the inner teeth 32 of the endless belt 31 are meshed with the teeth 22 of the gear 21 and the teeth 27 of the gear 26, and the endless belt 31 is caused to run along the outer surfaces of the guide plates 4 and 5. Next, tractor frame 1
Insert the hole 18 of No. 2 into the boss portion 23 of the gear 21,
The end surfaces of the gear 21 and the endless belt 36 are held down by the frame surface 13. Also tractor frame 12
The hole 19 is inserted into the boss portion 28 of the gear 26, and the end surfaces of the gear 26 and the endless belt 31 are pressed by the frame surface 13. At this time, the embossment 8 of the side plate surface 6 of the tractor frame 1 and the hole 1 of the tractor frame 12 are
7 is fitted. Furthermore, the holes 7 in the side plate surface 6 of the tractor frame 1 and the side plate surface 1 of the tractor frame 12
Align the holes 16 of No. 3 and fasten the tractor frames 1 and 12 together with screws 20.

At that time, a plurality of protruding members 3 protruding perpendicularly from both sides or one side of the endless belt 31
5 is fitted into the oval-shaped ring grooves 3 and 14 on the tractor frame surfaces 2 and 13.
The tractor assembly is now assembled.
Finally, the square-shaped drive member 44 is passed through the square hole 24 of the gear 21, and the round member 45 is passed through the square hole 24 of the gear 26.
Pass it to 9.

FIG. 4 shows the endless belt 31 of the first embodiment.
FIG. A plurality of protruding members 35 are provided to protrude perpendicularly from the side surface of the inner tooth portion 32 of the endless belt 31. If the projection member 35 has a cylindrical shape in this way, it will be easier to slide within the grooves 3 and 14.

FIG. 5 is a side view of an endless belt 31 according to a second embodiment of the present invention. In the first embodiment, a plurality of cylindrical protruding members 35 are provided on the side surface of the inner tooth portion 32, whereas in the second embodiment, flexible protruding members 35a are provided perpendicularly to the side surface of the band-shaped member 33. Protruding and continuous. It is clear that the second embodiment provides the same effects as the first embodiment.

FIG. 6 is a side view of an endless belt 31 according to a third embodiment of the present invention. It is clear that similar effects can be obtained even if a plurality of cylindrical protruding members 35b are provided that protrude perpendicularly from the side surface of the strip member 33 as in the first embodiment.

The first example will be described again. FIG. 7 is an explanatory diagram showing the shape of the groove 3 provided in the tractor frame 1. The groove 3 is provided in an oval shape on the tractor frame surface of the tractor frame 1, and a linear path portion and a circumferential path portion around the gears 21 and 26 are continuously provided.

FIG. 8 is an explanatory diagram showing the fourth embodiment. In contrast to the first embodiment, the fourth embodiment shows that grooves are provided only in the straight path portion. It is clear that the same effect as the first embodiment can be obtained even in this case.

(Effects of the invention) As explained above in detail, according to the invention,
A plurality of protruding members 35 are provided perpendicularly on both sides or one side of the endless belt 31, and according to the moving path of the protruding members 35,
Oval-shaped ring grooves 3, 14 are provided on the tractor frame surfaces 2, 13 to guide the protruding member 35. Therefore, the force that tends to return the linear path portion 36 of the endless belt 31 to a perfect circle is suppressed, so that the linear path portion 36 can be prevented from lifting or shifting even during rotation of the endless belt 31, and the linear path portion 36 can be prevented from shifting. Portion 36 is retained. Therefore, the paper may be bent due to lifting or deviation from the straight path portion 36 of the endless belt 31,
Alternatively, the occurrence of paper jams can be prevented.

Further, since there is no need to increase the tension of the endless belt 36, there is an effect that the driving load does not need to be increased.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the paper feeding mechanism of the present invention, Fig. 2 is a perspective view of the tractor frame shown in Fig. 1, Fig. 3 is a sectional view taken along the line C-C in Fig. 1, and Fig. 4 is an endless view. FIG. 5 is a side view of the first embodiment of the belt, FIG. 5 is a side view of the second embodiment, FIG. 6 is a side view of the third embodiment, and FIG. 7 is the first embodiment of the groove. FIG. 8 is an explanatory diagram of the fourth embodiment, and FIG. 9 is an exploded perspective view of a conventional paper feeding mechanism. 31... Flexible endless belt, 35... Projection member.

Claims (1)

[Claims for Utility Model Registration] 1. A set of tractor frames attached to a drive member, a belt drive means including a set of gears rotated by the drive member, and a belt drive means mounted on the set of tractor frames, A paper feeding mechanism having a flexible endless belt that integrates inner teeth, a band-like member, and an outer pin member, comprising: a protrusion member that projects perpendicularly from both sides or one side of the flexible endless belt; A paper feeding mechanism comprising a groove for restraining and guiding the protruding member on a side surface of the tractor frame. 2. The paper feeding mechanism according to claim 1, wherein a plurality of the protruding members are provided on the side surface of the inner teeth of the flexible endless belt. 3. The paper feeding mechanism according to claim 1, wherein the protruding member is provided in an endless shape or in plural on the side surface of a band-like member of a flexible endless belt. 4. The paper feeding mechanism according to claim 1, wherein the groove for restraining and guiding the projection member is an endless oval-shaped annular groove.