JPH0241275A - Platen supporting mechanism for printer - Google Patents

Abstract

PURPOSE:To simplify a construction and to reduce the working cost of a platen by rotatably supporting the cylindrical platen to a printer body, engaging a toothed belt with an annular groove formed on the outer periphery of the platen, and rotatably driving it by driving means. CONSTITUTION:A platen 20 is so supported at three points at ends by two lower supporting rollers 23, 23 and one upper supporting roller 26 as to form an isosceles triangular shape, annular grooves 27A, 27b are formed on the outer periphery near both ends, and a rotary shaft 30 is rotatably supported with bearings substantially in parallel with the axial direction of the platen 20 between lower both side plates 21A and 21A. A toothed belt 32 is engaged with the end of the shaft 30, and a toothed belt wheel is coupled to a toothed belt wheel 33A having a small diameter of a motor 33 of driving means supported to a printer body 21 through a toothed belt 34.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a platen support mechanism for a printer that rotatably supports a cylindrical platen around which paper is wound. The present invention relates to a printer platen support 111M suitable for a printer.

[Conventional technology]

First, an example of a conventional platen support mechanism for this type of printer will be explained with reference to FIGS. 3 and 4.

1. That is, a cylindrical platen 10 on which paper (not shown) is wound, and fan ports 2, 2 (only one shown in FIG. The platen receiver consists of two members 4, each having one end of a pair of support shafts 5, 5 inserted into the mounting hole 3 of the member 4 and fixed thereto. In addition, the printer body 6
Bearing holes 7.7 are coaxially formed in both side plates 6A, 6A facing each other, and the two supports @5.5 are rotatable in bushes 7A, 7A fitted in these bearing holes 7.7. It is inserted through and supported. Further, the other end of one of the support shafts 5 extends from the bearing hole 7 to the outside of the side plate 6A, and a toothed belt wheel 8 for paper feeding is sprayed onto the support shaft 5 at this portion. . This toothed belt pulley 8 is connected via a toothed bell 1-11 to a small diameter toothed belt pulley 10 of a motor 9, which is a driving means, mounted on one side plate 6A of the printer main body 6.

Note that a feed roller (not shown) is in contact with the outer peripheral surface of the platen 1.

The platen support mechanism of the conventional printer has the above-described configuration, so when the teeth 4 = J bell 1 to wheel 8 are rotated by driving the motor 9 and the toothed belt 11 runs, The platen 1 is rotated via the support shaft 5, and the paper wound around the outer peripheral surface of the platen 1 and held between the feed roller and the paper is fed.

[Problem to be solved by the invention]

However, in the conventional printer platen support mechanism described above, the cylindrical platen 1 has openings 2.2 at both ends.
The members 4 are fitted into the platen supports, and one end of each support shaft 5 is fitted into the mounting hole 3.3 drilled in the member 4, respectively. Since the platen 1 is supported by the printer main body 6 by being rotatably supported by each side plate 6A of the printer main body 6, the openings 2.2 at both ends of the platen 1 are processed into an appropriate shape, and then the platen receiver is The parts 414 must be fitted into each other, making the platen 1 expensive. Furthermore, when assembling the platen 1 to the side plate 6Δ, the support shaft 5 must be passed through the bearing hole 7 61. However, there are problems such as poor workability.

The present invention can overcome the problems of the conventional ones described above, simplify the configuration, reduce the processing cost of the platen itself, and improve the workability of assembly. 1] The purpose is to provide a printer platen support mechanism that can be used.

[Means to solve the problem]

In order to achieve the above-mentioned object, a printer platen support mechanism according to the present invention supports a cylindrical platen around which paper is wound by a printer main body, connects this platen to a driving means, and connects a J to this driving means. : In a platen support mechanism of a printer configured to rotationally drive a re-platen, a plurality of support rollers that come into contact with the outer peripheral surface of the platen are pivotally supported on the printer main body, and an annular groove is formed in the outer peripheral surface of the platen. The present invention is characterized in that a belt that can be rotated by the driving means is fitted into the annular groove.

[For production]

According to the present invention configured as described above, the cylindrical platen is
A plurality of support rollers in contact with the outer periphery are rotatably supported by the printer body by being pivoted to the printer body, and rotation of the platen is controlled by teeth in an annular groove formed on the outer periphery of the platen. Because this is done by fitting the attached belts, there is no need to process both ends of the platen, and the platen can be manufactured at a lower cost. There is no need to insert the shaft into the bearing hole of the printer body, and the platen can be easily supported by the printer body by simply placing it on a support roller that is pivotally supported by the printer body.
Workability during assembly can be improved compared to conventional ones.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

1 and 2 show an example of a printer equipped with a platen support mechanism according to the present invention, and in the figures, reference numeral 20 indicates a cylindrical platen around which paper P is wound. .

Both side plates 21A, 21 of the printer main body 21 facing each other
Two sets of support shafts 22, 22, which are made up of two pieces of wood separated horizontally, are supported at opposing positions of A (only one is shown in Figure 2). axis 22
A support roller 23 is rotatably supported on each of the support rollers 23 . The platen 20 is rotatably supported on a total of four supporting rollers 23 such that the lower portions of the outer circumferential surfaces of both ends of the platen 20 in the axial direction are in contact with the support rollers 23 .

Further, at the upper part of the outer periphery of both ends of the platen 20 in the axial direction, the platen 20 is supported by each of the side plates 21A so as to be movable in one downward direction, and is supported by a support shaft 25 that is always biased downward by a spring 24. Support rollers 26, each of which is rotatably supported, are always in rolling contact with each other in a downwardly biased state. As a result, each end of the platen 20 is supported at three points by the two lower support rollers 23, 23 and one partial support roller 26 to form an isosceles triangle. This prevents both ends of the platen 20 from protruding upward.

Annular 1M27A and 27b are formed on the outer peripheral surface near both ends of the platen 20, respectively.

The depth of these annular grooves 27A, 27B is approximately equal to the thickness of endless toothed belts 28A, 28B, which will be described later. Lower side plates 21A and 2I of the platen 20
A rotary shaft 30 is rotatably supported by a bearing (not shown) so as to be substantially parallel to the axial direction of the platen 20. Annular groove 27A of platen 20
.

Gears 31A and 31B are fitted in positions corresponding to 27[3. These gears 31A.

31B and an annular groove 27Δ having the teeth 29A and 29B,
27B, there is the toothed belt 28 for paper feeding described above.
A and 28B are constructed so as to mesh with each other. In addition, each toothed belt 28A, 28B has a spring 28.
A tension roller 28C biased by D is in pressure contact with each other, and each toothed belt 28A, 28B is always maintained in a tensioned state by this tension roller 28C.

A toothed belt 32 is sprayed onto the end of the rotating wheel 30, and this toothed belt wheel is connected to a small diameter toothed belt wheel 33Δ of a motor 33, which is a driving means supported by the printer main body 21. A.1 They are connected via a belt 34.

A vapor veil roller 35 having a plurality of rubber rollers at appropriate intervals in the axial direction is provided on the outer periphery of the platen 20.
These vapor veil rollers 3 are disposed at appropriate positions d so as to roll into contact with the roller 1 20 so that the paper P can be conveyed while being held between the platen 20.
5 is rotatably supported by the printer main body 21. Further, on the outer periphery of the toothed belt 34 wound around the outer periphery of the gears 31A and 31B, a small roller 3 for conveying the paper 1 by sandwiching the paper P between the toothed belt 34 and the toothed belt 34 is provided.
6.36 is provided, and this small roller 36.36 is pivotally supported by the printer main body 21.

Next, the operation of this embodiment having the above-described configuration will be explained.

In the assembly of the platen support mechanism of this embodiment, first, both side plates 21A of the printer main body 21 are assembled.

A pair of supports [1-L2
3.23 (N1), place the platen 20JIr on a total of four support rollers 23 so that the lower portions of the outer peripheral surface of both ends of the platen 20 are in contact with each other, and then place a support roller on each side plate 21A. 26 and platen 20.
The upper part of the outer circumferential surface of both ends of the printer body 2 is urged downward by the pressing force of the spring 2/I, and the platen 20 is securely held on each support roller 26.
Rotatably attach to 1. Next, in advance, the annular groove 2
Toothed bell l-28A fitted inside 7A and 27B
.

28 [3 is the toothed belt 31Δ connected to the motor 33
, 3181. : By applying W, the platen 20 can be connected to the motor 33 and the platen 20 can be rotationally driven. Therefore, the platen 20 is connected to the printer body 2.
1 can be easily assembled.

In addition, in the assembled printer, by driving the motor 33, the toothed belt ll32 is run via the toothed belt 34, and as a result, the rotation @30, the tooth width 3
1A and 31[3 are each rotated counterclockwise, and the toothed belt pulley 28A.

The platen 20 is similarly rotated in the counterclockwise direction via 28B. In this state, when the paper P is inserted between the platen 20 and the vapor veil roller 35, the paper P is conveyed in the direction of the arrow in FIG. 1 while being held between the platen 20 and the vapor veil roller 35. It is conveyed downward along the belts 28A, 28B, and further conveyed downward while being held between the small rollers 36, 36 and the toothed belts 28A, 28B.

As described above, according to this embodiment, it is no longer necessary to attach support shafts to both ends of the platen, which was extremely difficult to process, and the platen 20 can be formed by mainly machining the cylindrical outer periphery of the platen 20. Therefore, it can be manufactured at low cost.

Furthermore, when assembling the platen 20, there is no need to insert the support shaft of the large and heavy platen 20 into the bearing on the side plate of the printer body, and the platen 20 is simply placed on each support roller 26. Since it can be easily assembled by placing it in place, and the ease of assembly can be improved, the assembly work can be carried out efficiently. Furthermore, since the platen 20 can be supported in close proximity to the side plates 21A, 21A, a large-sized printer can be constructed without increasing its size.

Note that the present invention is not limited to the embodiments described above, and various changes can be made as necessary.

〔Effect of the invention〕

As explained above, according to the present invention, the configuration can be simplified, the processing cost of the platen itself can be reduced, and the workability of assembly can be improved. It has a great effect.

[Brief explanation of the drawing]

1 and 2 show an embodiment of a printer equipped with a platen support mechanism according to the present invention. FIG. 1 is a side view of the main part, FIG. 2 is a perspective view of the main part, and FIG. Figure 3 is a perspective view of the main parts of a printer with a conventional platen support mechanism;
FIG. 4 is a new view taken along line BB in FIG. 3. 20... platen, 21... printer body, 24...
... Spring, 25 ... Support shaft, 26 ... Support O-ra, 2
7A. 27r3...Annular groove, 28A, 28B...Toothed belt, 33...Motor, P...Paper. True 1 drawing L Vermilion 3 drawing book 4 closed

Claims (1)

[Claims] In a printer platen support mechanism in which a cylindrical platen around which paper is wound is supported by the printer main body, this platen is connected to a driving means, and the platen is rotationally driven by the driving means, the outer periphery of the platen is A plurality of support rollers that come into contact with the surface are pivotally supported on the printer main body, an annular groove is formed on the outer peripheral surface of the platen, and a belt that can be rotationally driven by the driving means is fitted into the annular groove. A printer platen support mechanism characterized by: