KR102023979B1 - Photo printer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photo printer, and more particularly, to a photo printer capable of precisely maintaining a shaft distance between a motor pinion, a reduction gear, and a platen gear.
The photo printer according to the present invention comprises a paper storage unit for storing paper; A head for applying heat to the paper to form an image; And a drive system for supplying and discharging the paper to the front, the drive system including: a pickup roller which protrudes from the bottom surface of the paper storage unit to transfer the paper to the front; A platen roller provided below the head to discharge paper forward; motor; A motor pinion for outputting a driving force of the motor; A reduction gear meshing with the motor pinion; A platen gear meshed with the reduction gear and provided on a shaft of the platen roller; A gear plate on which a shaft of the reduction gear is fixed; And a motor mounting bracket having a motor hole in which the motor and the motor pinion are mounted, and an alignment hole through which the shaft of the reduction gear passes.

Description

Photo printer equipped with a means for maintaining the distance between the gears {PHOTO PRINTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photo printer, and more particularly, to a photo printer capable of accurately forming an interaxial distance such that a motor pinion, a reduction gear, and a platen gear are precisely engaged.

The performance of cameras mounted on smart devices such as smartphones is approaching that of general digital cameras, and the population that captures memories by taking pictures with smart devices that are always easier to carry than digital cameras is increasing. As a result, consumers' desire to take photographs and print them immediately without any conversion is growing.

Reflecting such demands from consumers, photo printer products that can print pictures in a smartphone anytime and anywhere have been disclosed.

Although there are many types of such photo printers, there is disclosed a photo printer in which a printing paper employing a zero ink method is applied, so that no additional ink or a cartridge is required and thus a maintenance cost is low. Here, the zero ink method refers to a method in which a color corresponding to a cartridge is included in the paper to express colors using only heat. In other words, dyes expressing color in response to heat are stacked on paper to print an image (photo) or text by controlling the heating temperature or heating time of the head.

1 shows an engine 1 of a conventional photoprinter. As shown, the engine of the photo printer includes a paper storage unit 110, a pickup roller R1 and a platen roller R2, a head 141, a swing bracket 151 and a pressure bracket 161. .

The paper storage unit 110 has a space 111 is formed so that a plurality of sheets are stacked, the base 115 extending to the front side is coupled to the lower portion of the paper storage unit 110.

The pickup roller R1 protrudes from the bottom surface of the paper storage unit 110 and supplies the paper located at the lowermost portion of the stacked paper to the front.

The head 141 is provided on the platen roller R2, and the head 141 prints an image or text by expressing a color corresponding to the temperature by applying heat of a predetermined temperature to the paper.

The paper enters between the head 141 and the platen roller R2. The head 141 is mounted on the swing bracket 151 to be rotatable.

In addition, the head 141 is in close contact with the paper transfer heat, in this way is provided with a pressure bracket 161 for pressing the head 141 downward in order to adhere the head 140 to the paper. The pressing bracket 161 is formed with a pressing portion 161 for pressing the upper portion of the head 141.

On the other hand, the spring (S) is connected between the pressing bracket 161 and the engaging portion (115a) formed in the base 151.

A drive system for supplying and discharging paper will be described in detail with reference to FIGS. 2 and 3.

As shown, platen rollers 125 are provided at both sides of the platen roller R2, and at one side, driving force of the motor M through the plurality of reduction gears 122 to 124 and the motor pinion 121. Is passed.

When the platen roller R2 is rotated by the driving force of the motor M as described above, the transmission gear 132 engaged with the platen gear 133 by the rotation of the other platen gear 133 and the pickup gear 131 are rotated. The pickup roller R1 is rotated.

In general, the rotation speed of the platen roller R2 is configured to be faster than the rotation speed of the pickup roller R1.

Meanwhile, a gear plate 120 is provided at one side of the paper storage unit 110, and a motor hole in which the motor M and the motor pinion 121 are mounted is formed on the gear plate 120, and the reduction gear shaft Mounting holes in which the 122a through 124a are mounted and through holes through which the shaft 125a of the platen roller passes.

Therefore, the interaxial distance d1 between the motor pinion shaft 121a and the first reduction gear 122a, the interaxial distance d2 between the first reduction gear 122 and the second reduction gear 123, and the second reduction gear The motor hole of the gear plate 120 in accordance with the interaxial distance d3 between the third reduction gear 124 and the third reduction gear 124 and the interaxial distance d4 between the third reduction gear 124 and the platen gear 125. And machining the mounting holes and the through holes.

Therefore, the motor M and the motor pinion 121 are mounted in the machined motor hole, the reduction gear shafts 122a to 124a are mounted in the mounting holes, and the shaft 125a of the platen roller passes through the through hole. As a result, the interaxial distance is precisely adjusted as designed.

In other words, in the case of the conventional drive system, the motor M, the motor pinion 121 and the reduction gears 122 to 124 are mounted on the gear plate 120 which is one component, and the platen roller R2 is mounted through. Since the distance between the shafts of the gears 121 to 125 can be precisely matched, there is an advantage that the gears can be precisely engaged between the gears 121 to 125.

However, since the motor plate M, the motor pinion 121, and the reduction gears 122 to 124 are mounted on the gear plate 120 and the platen roller is mounted therethrough, there are limitations in designing in various forms. For example, in order to drastically reduce the engine size of the photoprinter, rearrangement of the motors and reduction gears is required, which causes a problem in that the gears cannot be precisely matched with each other.

Patent Application No. 10-2016-0116968 Patent Application No. 10-2016-0116967

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a photo printer capable of precisely maintaining the shaft distance between the motor pinion, the reduction gear, and the platen gear.

In particular, to reduce the size of the photo printer, even when the motor pinion is not mounted on the gear plate but on a separate motor mounting bracket, the photo printer can be assembled while maintaining the shaft distance between the motor pinion and the neighboring reduction gear as designed. Is in.

In order to solve the above technical problem, the photo printer according to the present invention includes a paper housing for accommodating paper; A head for applying heat to the paper to form an image; And a drive system for supplying and discharging the paper to the front, the drive system including: a pickup roller which protrudes from the bottom surface of the paper storage unit to transfer the paper to the front; A platen roller provided below the head to discharge paper forward; motor; A motor pinion for outputting a driving force of the motor; A reduction gear meshing with the motor pinion; A platen gear meshed with the reduction gear and provided on a shaft of the platen roller; A gear plate on which a shaft of the reduction gear is fixed; And a motor mounting bracket having a motor hole in which the motor and the motor pinion are mounted, and an alignment hole through which the shaft of the reduction gear passes.

In addition, the gear plate is preferably formed with a through hole through which the shaft of the platen roller penetrates.

In addition, the distance between the alignment hole and the center of the motor hole is preferably formed equal to the distance between the shaft of the motor pinion and the reduction gear. That is, the distance between the alignment hole and the center of the motor hole is preferably equal to the sum of the radius of the motor pinion and the radius of the reduction gear.

In addition, the motor mounting bracket is formed with a fastening hole through which the screw is screwed to the paper storage unit, the fastening hole is larger than the diameter of the screw so that the movement of the motor mounting bracket in the state that the screw is fastened. desirable.

In addition, a plurality of reduction gears are provided, and a plurality of mounting holes are formed in the gear plate such that the shafts of the plurality of reduction gears are coupled, and the alignment holes penetrate the shafts of the reduction gear closest to the motor pinion. Do.

According to the present invention, it is possible to assemble the motor pinion, the reduction gear and the platen gear while maintaining the distance between the axes accurately.

In particular, in order to reduce the size of the photo printer, even if the motor pinion is not mounted on the gear plate and is mounted on a separate motor mounting bracket, it can be assembled while maintaining the shaft distance between the motor pinion and the neighboring reduction gear according to the design dimension.

Therefore, high-quality images can be obtained because the pinion of the motor pinion and the neighboring reduction gear are precisely fed to feed the paper accurately.

1 to 3 show a conventional photo printer.
4 to 6 show the configuration of the embodiment according to the present invention.
7 to 10 show the assembly sequence of the embodiment according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the embodiment according to the present invention.

4 and 5, the engine for a photo printer 1 according to the present invention includes a paper storage unit 10 and a head for implementing an image by applying a predetermined heat to the paper (see '141' in FIG. 1). ), And a drive system for supplying and discharging the paper stacked in the paper storage unit 10 to the front.

The drive system includes a pickup roller R1, a platen roller, a motor M, a motor pinion 21, a plurality of reduction gears 22 to 24, a platen gear 25, a transmission gear, a pickup gear, and the like. It includes.

Of these, the transmission gear and the pickup gear are similar with reference to FIG.

The pickup roller R1 is a roller which protrudes from the bottom surface of the paper storage part and delivers the paper forward, and the platen roller is a roller which is disposed under the head and discharges the paper forward.

The motor M generates a driving force for rotating the platen roller and the pickup roller R1.

The motor pinion 21 is a component that is connected to the rotating shaft of the motor (M) to output a driving force.

One of the reduction gears 22 to 24 is engaged with the motor pinion 21, and the other is engaged with the platen gear to decelerate the driving force and transmit it to the platen gear 25. In this embodiment, the reduction gear includes a first reduction gear 22, a second reduction gear 23, and a third reduction gear 24.

The platen gear 25 is coupled to the rotating shaft 25a of the platen roller.

5 to 7, the motor mounting bracket 40 and the gear plate 30 are provided at one side of the paper storage unit 10.

Three mounting holes 22b to 24b to which the shafts 22a to 24a of the first to third reduction gears 22 to 24 are coupled to the gear plate 30, and the shaft 25a of the platen roller The through hole 25b penetrates is formed.

The distance between the mounting holes 22b to 24b is precisely processed in consideration of the radius of the first to third reduction gears 22 to 24. Therefore, when the shafts 22a to 24a of the reduction gears are fixed to the mounting holes 22b to 24b, the distance between the shafts of the reduction gears 22 to 24 is precisely maintained according to the design value.

Similarly, by precisely machining the distance between the third mounting hole 24b and the through hole 25b, the distance between the axes of the third reduction gear 24 and the platen gear 25 can also be assembled while maintaining precision.

Therefore, the reduction gears 22 to 24 coupled to the gear plate 30 and the platen gear 25 coupled to the shaft passing through the gear plate 30 can be precisely engaged.

In this embodiment, unlike the prior art illustrated in FIG. 3, the motor M and the motor pinion 21 are not mounted on the gear plate 30, but are mounted on a motor mounting bracket 40 which is a separate plate. Able to know.

As such, by attaching the motor M to the separate motor mounting bracket 40 instead of the gear plate 30, the size of the engine can be designed smaller, and the design advantages that can be formed in various shapes are provided. many.

Nevertheless, since the motor pinion 21 is not mounted on the gear plate 30, it is very difficult to make the first reduction gear 22 and the motor pinion 21 precisely engage. In other words, it is very difficult to assemble in a state in which the interaxial distance between the first reduction gear 22 and the motor pinion 21 is precisely maintained.

In other words, the distance between the shaft of the motor pinion 21 and the first reduction gear 22 remains the same as that of [the radius of the motor pin + the radius of the first reduction gear].

As such, if the distance between the first reduction gear 22 and the motor pinion 21 is not precisely assembled and assembled, the motor pinion 21 and the first reduction gear 22 may not be accurately engaged, and thus the gears 21 and 22 may not be assembled. This is a very important problem for high quality image formation because there is a problem that they are destroyed or a power transmission error occurs.

The present invention is to solve this problem, the alignment hole 41 is formed in the motor mounting bracket 40, the shaft 22b of the first reduction gear 22 in the alignment hole 41 By penetrating, the distance between the shafts of the motor pinion 21 and the first reduction gear 22 can be precisely matched.

The distance between the center of the motor hole 42 and the alignment hole 41 on which the motor M or the motor pinion 21 is mounted in the motor mounting bracket 40 is the motor pinion 21 and the first reduction gear ( It is formed equal to the distance between the shafts of 22).

In other words, precisely determine the distance between the motor hole and the alignment hole such that (the distance between the motor hole on which the motor or the motor pinion is mounted and the center of the alignment hole) = (the radius of the motor pinion + the radius of the first reduction gear). It is calculated and formed.

Hereinafter, the assembly sequence of the embodiment according to the present invention.

First, the shafts 22a to 24a of the first to third reduction gears are fixed to the mounting holes 22b to 24b of the gear plate 30, and the shaft 25a of the platen roller is fixed to the through hole 25b. It penetrates and mounts (refer FIG. 7). As a result, the distance between the shafts between the reduction gears 22 to 24 and the distance between the shafts of the third reduction gear 24 and the platen gear 25 are precisely set. The engagement between the three reduction gears 24 and the platen gear 25 is precise.

Next, the motor M and the motor pinion 21 are mounted on the motor mounting bracket 40 (see FIG. 7).

Next, the shaft 22a of the first reduction gear passes through the alignment hole 41 formed in the motor mounting bracket 40 (see FIG. 8).

Next, the screws b1 and b2 are fastened to the fastening holes h1 and h2 formed in the motor mounting bracket 40 (see FIG. 8). Meanwhile, correspondingly, fastening holes (see FIGS. 5 and 6 'h3' and 'h4') are formed in the paper storage unit and the gear plate, respectively.

Finally, the first to third reduction gears 22 to 24 are mounted and engaged to the shafts 22a to 24a fixed to the gear plate 30.

Accordingly, the motor pinion 21, the first reduction gear 22, the first reduction gear 22, the second reduction gear 23, the second reduction gear 23, the third reduction gear 24, and the third reduction reduction Since the axial distance between the gear 24 and the platen gear 25 is assembled in a precisely maintained state, these gears are precisely engaged (see FIG. 9).

10 is a view seen from the opposite side in the assembled state as shown in FIG. As shown, screws (b1, b2) are fastened to the fastening holes (h1, h2) on both sides of the motor (M), the fastening holes (h1, h2) formed in the motor mounting bracket 40 is a screw ( It can be seen that it is relatively larger than the diameters of b1 and b2) (see enlarged view). As such, the diameters of the fastening holes h1 and h2 are larger than the diameters of the screws b1 and b2 so that the alignment holes are precisely aligned through the first reduction gear shaft 22a through the alignment holes 41. It is to fix as it is.

Therefore, instead of the fastening holes h1 and h2 larger than the diameters of the screws b1 and b2, it is also possible to form a long hole.

1: Example (Engine)
10: paper storage
21: motor pinion
22 ~ 24: reduction gear
25: Platen Gear
30: Gear Plate
40: motor mounting bracket
41: alignment hole
42: motor hole

Claims (3)

Stacking and accommodating paper, and a paper storage portion in which a pickup roller protrudes from the bottom surface;
A platen roller for discharging paper fed by the pickup roller to the front;
A head provided on an upper portion of the platen roller to form an image on a conveyed paper;
A motor providing a driving force to the platen roller;
A motor pinion for outputting a driving force of the motor;
A reduction gear meshing with the motor pinion and decelerating a rotation speed of the motor;
A gear plate provided on one side of the paper storage part, and the reduction gear is axially coupled; And
And a motor mounting bracket provided on one side of the paper storage unit adjacent to the gear plate and having an alignment hole through which the shaft of the reduction gear penetrates, and a motor hole through which the rotating shaft of the motor penetrates.
The motor mounting bracket and the gear plate are provided so that a part of each other overlap, and the alignment hole is formed in the overlapping portion of the motor mounting bracket.
The method of claim 1,
A fastening hole h1 is formed in the motor mounting bracket so that the screw for coupling the motor mounting bracket to one side of the paper storage part passes through the motor mounting bracket.
The fastening hole is a photo printer, characterized in that larger than the diameter of the screw (b1).
The method of claim 1,
The gear plate is coupled to the plurality of reduction gear shaft,
And the shaft of the reduction gear closest to the motor passes through the alignment hole.

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