JP2771922B2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer in which a rotating component such as a platen roller and a paper feed roller is rotatably mounted between a pair of frames facing each other.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing an example of a frame of a conventional thermal printer. In the figure, reference numerals 1 and 2 denote a pair of frames facing each other. These frames 1 and 2 have a plurality of through holes 1a, 2a. Such conventional frames 1 and 2
Is generally of an integral structure manufactured by sheet metal and die casting.

[0003]

In the conventional printer as described above, when a rotating component such as a rubber roller 3 is mounted between the frames 1 and 2, one end is attached to the frame as shown by an arrow in FIG. 2 through the through hole 2a,
The operation is very complicated, such as moving the whole body in the axial direction, inserting the other end into the through hole 1a of the frame 1, and then attaching another component such as an E-ring to prevent displacement in the axial direction. There are problems such as troublesome and long assembly time.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a printer which can simplify an assembling operation and shorten an assembling time. And

[0005]

According to a first aspect of the present invention, there is provided a printer in which a frame is divided into a plurality of unit frames by a dividing surface passing through a through hole.

In the printer according to the second aspect of the present invention, the frame is divided into a plurality of unit frames by a dividing surface passing through the through-hole, and a positioning portion for positioning the unit frames relative to each other is provided in each unit frame. Things.

[0007]

According to the first aspect of the present invention, the through-hole is divided by the dividing surface, so that the shaft of the rotating component can be directly dropped into the through-hole from the outer diameter direction.

According to the second aspect of the present invention, the through-hole is divided by the dividing surface so that the axis of the rotating component can be directly dropped into the through-hole from the outer diameter direction, and the positioning between the unit frames is performed by the positioning portion. Is performed, the components mounted on each unit frame are positioned relative to each other.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a side view showing a main part of a thermal printer according to an embodiment of the present invention. In the figure, reference numeral 11 denotes a base control unit (control box unit).

Reference numeral 12 denotes a first unit frame made of a synthetic resin provided on the control unit 11. The first unit frame 12 is, for example, a shaft of a rotating component such as a paper feed roller 16 (FIG. 6). Has a plurality of through-holes 12a that penetrate therethrough.
In addition, a paper feed component is mounted on the first unit frame 12 to form a paper feed unit. FIG. 2 shows the first
FIG. 12B is a side view showing details of the unit frame 12 of FIG.
Numeral denotes a convex portion for positioning which engages with a concave portion (not shown) of the control unit 11, 12c denotes a screw for fixing, and 12d denotes an engaging projection as a positioning portion provided at one end.

Reference numeral 13 denotes a second unit frame made of a synthetic resin provided on the control unit 11. The second unit frame 13 is, for example, a platen roller (not shown).
And the like have a plurality of through holes 13a through which the shaft of the rotating component passes. Further, parts for transporting the paper during printing, such as a paper transport clamper and a belt and pulley for moving the paper transport clamper, are mounted on the second unit frame 13 to constitute a paper transport unit. FIG. 3 is a side view showing details of the second unit frame 13, and 13b is a control unit.
A protrusion engaging with a concave portion (not shown) of 11, 13 c is a fixing screw, and 13 d is an engaging protrusion 12 d of the first unit frame 12.
This is an engaging portion as a positioning portion that engages with.

Reference numeral 14 denotes the first and second unit frames 11,
This is a third unit frame made of synthetic resin provided on 12, and an ink sheet roll (not shown) is mounted on the third unit frame 14 to constitute an ink sheet transport unit. Reference numeral 15 denotes a paper discharge unit. Also, the first to third unit frames 1
2, 13, and 14 form the frame 21 of this embodiment. Further, a frame (not shown) facing the frame 21 is similarly divided.

Here, the first unit frame 12 is positioned with respect to the control unit 11 by bringing each projection 12b into contact with the inner wall of the recess of the control unit 11. Further, as shown in FIG. 4 which is an enlarged view of a portion A in FIG. 1, the second unit frame 13 has an engaging portion 13
d, the first unit frame 12
Is positioned with respect to

Further, as shown in FIG. 5 which is an enlarged view of a portion B in FIG. 1, the third unit frame 14 includes first and second units.
The first and second unit frames 12 and 13 are attached to hold the first and second unit frames 12 and 13 by engaging the engaging portions 14a and 14b, which are positioning portions, respectively. It is positioned with respect to the second unit frames 12 and 13.

In the thermal printer configured as described above, since the frame 21 is divided into the first to third unit frames 12, 13, and 14 by the division plane passing through the through holes 12a and 13a, the rotating parts are formed. Can be easily mounted, and the assembling property can be improved. FIG. 6 is a perspective view showing a state in which the sheet feeding unit is being assembled. For example, the shaft of the sheet feeding roller 16 is
It can be mounted without moving in the axial direction simply by dropping from the radial direction. Therefore, the rotating component can be assembled as a unit by assembling it on the shaft in advance. Also, by dividing the frame 21 for each unit,
The assembling work of each unit can also be performed in parallel, thereby shortening the assembling time. Further, although the rigidity of each unit is low, the rigidity as a whole is sufficiently high by connecting these units.

The unit frames 12, 13, 14 are provided with positioning portions for positioning each other, that is, engaging projections 12d and engaging portions 13d, 14a, 14b, so that the entire assembly can be performed with high accuracy. It can be performed well, and the positioning accuracy between the units can be improved. In particular, since the positioning of the paper transport unit with respect to the paper feed unit requires high precision and parallelism, it is convenient to directly perform the positioning without the control unit 11.

Further, since the pinch roller provided in the paper feed unit presses the platen roller provided in the paper transport unit, a force is generated between the paper feed and paper transport units so as to move away from each other. In the example, the third
The unit frame 14 is mounted so as to embrace the first and second unit frames 12, 13, so that the sheet feeding and sheet transport unit is prevented from being separated.

The method of dividing the frame 21 is not limited to the above embodiment, but may be determined as appropriate according to the position of each component. Further, in the above-described embodiment, an example of the thermal printer has been described, but another printer may be used.

[0019]

As described above, in the printer according to the first aspect of the present invention, the frame is divided into a plurality of unit frames by the dividing surface passing through the through hole, so that the axis of the rotating component is extended from the outer diameter direction to the through hole. In addition, the components can be dropped into the frame as it is, and the parts can be assembled to the frames for each unit frame. Therefore, there are effects that the assembling work can be simplified and the assembling time can be shortened. Also, one of the unit frames
Hold other unit frames in the unit frame
The unit flare due to the force acting between the rotating parts.
An engagement portion is provided to prevent the arms from being separated from each other.
The simple structure prevents separation of the unit,
Body assembly strength can be improved.

Further, in the printer according to the present invention, the frame is divided into a plurality of unit frames by a dividing surface passing through the through-hole, and a positioning portion for positioning the unit frames is provided in each unit frame. Therefore, in addition to the effects of the first aspect of the present invention, the positioning of the unit frames can be easily performed with high accuracy, and the positioning between the components mounted on each unit frame, that is, the positioning between the units can be accurately and easily performed. It has the effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a thermal printer according to an embodiment of the present invention.

FIG. 2 is a side view showing details of a first unit frame of FIG. 1;

FIG. 3 is a side view showing details of a second unit frame of FIG. 1;

FIG. 4 is an enlarged view of a portion A in FIG. 1;

FIG. 5 is an enlarged view of a portion B in FIG. 1;

FIG. 6 is a perspective view illustrating a state in which the sheet feeding unit is being assembled.

FIG. 7 is a perspective view showing an example of a frame of a conventional thermal printer.

FIG. 8 is a perspective view showing a state where a rubber roller is attached to FIG. 7;

[Explanation of symbols]

 12 first unit frame 12a through hole 12d engaging projection (positioning portion) 13 second unit frame 13a through hole 13d engaging portion (positioning portion) 14 third unit frame 14a engaging portion (positioning portion) 14b Joining part (positioning part) 16 Paper feed roller (rotating part) 21 Frame

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-154870 (JP, A) JP-A-62-11671 (JP, A) Real opening Sho-61-90547 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) B41J 29/02 B41J 11/02

Claims (2)

(57) [Claims] 1. A pair of frames having a plurality of through holes facing each other, and a plurality of rotating parts rotatably mounted between the frames by passing a shaft through the through holes. In the printer, the frame is divided into a plurality of unit frames by a dividing surface passing through the through hole.
One of the above unit frames
In the frame, embrace other unit frames
As a result, the unit deflection is caused by the force acting between the rotating parts.
An engagement portion is provided to prevent the arms from being separated from each other.
Printer, characterized in that that. 2. The printer according to claim 1 , wherein each unit frame is provided with a positioning portion for positioning said unit frames relative to each other.