JPH091884A - Sheet material takeup mechanism recorder - Google Patents

Abstract

PURPOSE: To stabilize the transfer of a sheet material and make it easy to execute maintenance, while saving a space for installation of a drive mechanism, by engaging a gear to rotate a sheet material takeup shaft with the gear of a gear section, driving a drive motor, and transferring the sheet material. CONSTITUTION: A drive motor 91 does not require constant current control and produces a slip to a friction shaft 93 and a friction collar 96 with a constant torque by friction pads 94, 95, only by rotational driving with higher torque and speed than needed to take up an ink sheet, and a gear 92 rotates continuously. Thus, the ink sheet is never transferred through a separation member. A clutch mechanism comprised of the gear 92, the friction shaft 92, the friction pads 94, 95, the friction collar 96, a spring 97, and a stopper 98, is fixed by fixing screws 991, 992, and can be removed easily from the drive motor 91 by loosening them, and maintenance can be easily effected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to transfer an ink onto a recording paper by pressing an ink sheet against the recording paper with a thermal head, moving the ink sheet and the recording paper, and selectively driving the thermal head. The present invention relates to a recording apparatus such as a thermal transfer recording apparatus that performs recording, and more specifically to a sheet material winding mechanism that winds a sheet material such as an ink sheet or recording paper.

[0002]

2. Description of the Related Art FIG. 3 is a view showing a thermal transfer recording apparatus of this type, which comprises a thermal head 1, a platen roller 2, a peeling member 3, a guide roller 4, an ink sheet 5, and a recording paper 6. The platen roller 2 includes a recording device body 8
The thermal head 1 is rotatably supported by the platen roller 2. The thermal head 1 is arranged so as to be pressed against and separated from the outer peripheral surface of the platen roller 2. Further, the recording paper 6 and the ink sheet 5 are sequentially laminated from the platen roller 2 side, and are conveyed onto the platen roller 2 via the guide rollers 4 respectively.
The thermal head 1 is pressed against the platen roller 2. The ink sheet 50 is formed by applying ink that is sublimated or melted by heating on the surface of a base film (for example, polyethylene terephthalate (PET) film) serving as a base material.

When recording is performed by this thermal transfer recording apparatus, the platen roller 2 and the ink sheet take-up roll 51 are rotated, and the recording paper 6 and the ink sheet 50 which are pressed against the platen roller 2 by the thermal head 1. Is configured to transfer the ink applied to the surface of the ink sheet 50 onto the recording paper 5 and to perform recording by selectively driving the heating resistor formed on the thermal head 1 while carrying Has been done. The transferred ink sheet 50 is peeled off from the recording paper 6 by the peeling member 3 and is wound around the ink sheet winding roll 51, and the recording paper 6 is sequentially conveyed and discharged. Further, in order to wind up the ink sheet 50 after the ink is transferred onto the recording paper 6 by the thermal head 1, the ink sheet take-up roll 51
The driven gear 53 engaged with the shaft of the drive gear 7 of the drive mechanism 7.
The two gears are engaged with each other, and the drive gear 72 transmits the rotational drive force.

In the conventional thermal transfer recording apparatus of this type, an inexpensive DC motor is used as a drive motor for rotating the drive gear 72, and electric power is supplied to the drive motor through a constant current circuit. The winding torque by the drive motor is configured to be stable.

However, due to the intermittent rotation (so-called torque ripple) caused by the magnetic structure of the motor, the recording paper 6 and the ink sheet 5 cannot be separated well, which causes a problem of recording failure. That is, when the shaft of the drive motor is directly transmitted to the shaft of the ink sheet take-up roller 51, if the above-described torque ripple occurs and the ink sheet take-up roller 51 is not driven for a minute time, the recording paper 6 is conveyed. As shown in FIG. 5, the ink sheet 50 is conveyed by a minute distance a. Next, when the ink sheet take-up roller 51 is driven from this state to take up the ink sheet 51, the ink sheet 50 conveyed by the recording paper 6 is conveyed.
(The portion indicated by a in FIG. 5) cannot be peeled off by the peeling member 3, whereby the ink in the vicinity of the portion heated by the thermal head 1 is also transferred to the recording paper 6, and this is intermittent in the motor. This occurs every time the printer is stopped, causing a defect that a striped pattern is recorded (so-called peeling stripe).

In order to solve this problem, in the conventional apparatus, the rotational driving force of the drive motor is not directly transmitted to the ink sheet take-up roll 51, but an ink sheet is intermittently taken up by interposing a friction clutch. It was configured to prevent. That is, in the conventional recording apparatus, the ink sheet take-up drive mechanism 7 as shown in FIG. 4 is configured. In this figure, 71 is a drive motor composed of a DC motor, 72 is a drive gear, 73 is a stopper collar, 74 is a friction pad, 75 is a friction collar, 76 is an elastic member, 77
Is a mounting plate, and the stopper collar 73, the friction pad 74, and the friction collar 75 constitute a clutch mechanism.

The drive motor 71 is attached to the attachment member 77 so as to be separated from the frame 81 of the recording apparatus main body 8 by a predetermined distance.
Friction frame 75 and friction pad 7 between the frame and the frame 81
4, a stopper collar 73 is provided. A shaft of a drive gear 72 that meshes with the driven gear 53 of the ink sheet take-up roller 51 is fixed to the stopper collar 73, and the rotational force of the stopper collar 73 is transmitted through the drive gear 72 to the driven gear 53, It is transmitted to the ink sheet take-up roller 51. The motor shaft of the drive motor 71 has a cylindrical shape having a flat surface portion having a D-shape in cross section, and the friction collar 75 is slidable in the axial direction on the motor shaft and in the rotational direction of the shaft by the flat surface portion. It is attached so that it is fixed. Further, the friction collar 75 is pressed against the stopper collar 73 by sandwiching the friction pad 74 by an elastic member 76 which is a compression spring. The rotational force of the drive motor 71 is the friction collar 75.
Is directly transmitted to the stopper collar through the friction pad 74, and the rotating force of the stopper collar 75 is directly transmitted through the drive gear 72 and the driven gear 53 meshing with the drive gear 72. And is transmitted to the ink sheet take-up roller 51. In the ink sheet take-up drive mechanism 7, the DC motor, which is a drive motor, rotates the ink sheet take-up roller 51 by frictional force only by rotating at a required torque and speed for taking up the ink sheet without constant current control. It is configured to be continuously rotated and driven so as not to cause the above-mentioned peeling stripes.

[0008]

However, this conventional apparatus requires a space for mounting the friction clutch mechanism, which causes a problem that the recording apparatus becomes large in size. Further, it is necessary to replace the worn friction pad 74 by using the recording device for a long period of time, but in this case, in the conventional device, the friction clutch mechanism including the drive motor 71 must be completely removed. There was a problem that the maintenance work was complicated.

The present invention has been made in order to solve these problems. The sheet material such as an ink sheet can be stably conveyed without requiring a space for installing a driving mechanism, and maintenance work can be performed. An object of the present invention is to provide a sheet material winding mechanism for a recording apparatus that can be easily performed.

[0010]

In order to solve the above problems, in a sheet material winding mechanism of a recording apparatus of the present invention, a friction shaft fixed to a rotation shaft of a drive motor and friction against this friction shaft. A gear portion consisting of a gear engaged through a pad, a friction collar engaging the gear of the gear portion through a friction pad, an elastic member for urging the friction collar to press the gear portion, It consists of a stopper collar that locks the member and is fixed to the friction shaft of the gear part, and that further fixes this friction shaft to the rotation shaft of the drive motor. The sheet material is conveyed by rotating the drive motor to rotate. Also, the stopper collar is detachably attached to the rotary shaft of the drive motor. Further, in a recording apparatus that presses the ink sheet and the recording sheet against the platen roller 3 by the thermal head, conveys the ink sheet and the recording sheet, and selectively drives the thermal head to perform recording, the gear of the gear unit is set to the ink sheet. The ink sheet is wound by rotating a drive motor to engage a gear that rotates a shaft that winds the ink sheet.

[0011]

The rotation of the drive motor is transmitted to the gear through the friction clutch including the stopper collar, the elastic member, the friction collar, the friction shaft and the friction pad, and the rotation of the gear rotates the shaft for winding the sheet material. The drive motor is
The ink sheet can be wound with a constant torque due to the frictional force of the friction pad by rotating the ink sheet at a torque or speed higher than the required torque and speed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sheet material winding mechanism of the recording apparatus of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing a sheet material winding mechanism of the present invention. As shown in the figure, the sheet material winding mechanism 9 includes a DC motor 91 as a drive motor, a gear 92, a friction shaft 93, and a first friction member. Pad 94,
It comprises a second friction pad 95, a friction collar 96, an elastic member 97 which is a compression spring, a stopper collar 98, and a screw 99 for fixing each position. Further, FIG. 1 shows a sheet material winding mechanism 9 engaged with an ink sheet winding roll 51 as a winding mechanism of the ink sheet 5 in the thermal transfer recording apparatus, such as a recording unit and a recording paper conveying mechanism. The structure is similar to that of the conventional recording apparatus shown in FIG.

As shown in FIG. 1, each of the friction shaft 93 and the friction collar 96 has a friction surface formed to be inclined in a sectional view, and the gear 92 corresponds to these friction surfaces. A friction surface having a V-shaped cross section is provided. One friction surface of the gear 92 is engaged with the friction surface of the friction shaft 93 via the first friction pad 94, and the friction surface of the friction collar 96 is the second friction surface on the other friction surface.
The friction pads 95 are engaged with each other. That is, the first friction pad 94, the gear 92, the second friction pad 95, and the friction collar 96 are sequentially attached to the cylindrical shaft portion of the friction shaft 93. The stopper collar 98 is attached to the shaft portion of the friction shaft 93 via a spring 97 as an elastic member, and is fixed to the friction shaft 93 by a first fixing screw 991. That is, by tightening the first fixing screw 991 in the screw holes provided in the stopper collar 96 and the shaft portion of the friction shaft 93, respectively,
8 is fixed to the friction shaft 93. At this time, the spring 97, which is a compression spring, presses the friction collar 96 toward the friction shaft 93, whereby the gear 92 is moved to the friction pads 94, 9.
5 is held by the friction shaft 93 and the friction collar 96. These gears 92, friction shafts 93, friction pads 94
And 95, the friction collar 96, the spring 97, and the stopper collar 98 constitute a clutch mechanism, and the clutch mechanism is constituted by the second fixing screw 992 and the drive motor 9
1 is fixed to the rotating shaft 912. That is, the second fixing screw 992 penetrates the screw holes provided in the stopper collar 98 and the shaft portion of the friction shaft 93, respectively, and the tip end portion of the second fixing screw 992 comes into contact with the flat surface portion of the rotary shaft 912 of the drive motor 91 and is tightened. As a result, the above-mentioned clutch mechanism is attached to the rotary shaft 9
It is attached to 12 and fixed. Further, the gear 92 of the sheet material winding mechanism 9 of the present invention also meshes with the driven gear 53 engaged with the shaft of the ink sheet winding roll 51, as in the above-described conventional thermal transfer recording apparatus.

Next, the operation of the sheet material winding mechanism 9 of the present invention in the recording operation will be described. At the time of recording, similarly to the recording apparatus described above, the platen roller 2 and the ink sheet take-up roll 51 are rotated, and the recording paper 6 and the ink sheet 50 which are pressed against the platen roller 2 by the thermal head 1. The ink applied to the surface of the ink sheet 50 is transferred onto the recording paper 5 for recording by selectively driving the heating resistor formed on the thermal head 1 at the same time as the sheet is conveyed. In this recording operation, the drive motor 91 is driven to wind up the ink sheet 50, the rotation of the rotating shaft 912 is transmitted to the ink sheet take-up roll 51 via the clutch mechanism, and the ink sheet take-up roll 51 is rotated to move the ink sheet 50. Roll up.

The rotating shaft 912 rotates a friction shaft 93, a friction collar 96 and a stopper collar fixed to the rotating shaft 912, and this rotation is carried out via friction pads 94 and 95 and a gear 92.
Is transmitted to The rotation of the gear 92 is transmitted to the driven gear 53 of the meshed ink sheet take-up roll 51, which causes the ink sheet take-up roll 51 to rotate to wind up and convey the ink sheet 50.

In the sheet material winding mechanism 9 of the present invention,
The drive motor 91 does not require constant current (constant torque) control, and is simply driven to rotate at a torque and a speed higher than necessary for winding up the ink sheet.
4, 95 causes the gear 92 to slide on the friction shaft 93 and the friction collar 96 with a constant torque, and the gear 92 continuously rotates. As a result, the ink sheet 50 does not pass through the peeling member 3 and is conveyed unlike the conventional apparatus described above.

In the present invention, the gear 92 and the friction shaft 9
3, the clutch mechanism including the friction pads 94 and 95, the friction collar 96, the spring 97, and the stopper collar 98 uses the second fixing screw 952 to rotate the rotary shaft 9 of the drive motor.
12 is fixed to the drive motor 91 and can be easily removed from the drive motor 91 by loosening the second fixing screw 952. The drive motor 91 is recorded when maintenance work such as replacement of the friction pads 94 and 95 is performed. There is no need to remove it from the device body 8. Further, the drive motor main body 911 is directly attached to the frame 81 of the recording apparatus main body, so that the installation space for the clutch mechanism, which has been conventionally provided, is unnecessary.

In the above-mentioned embodiment, the sheet material winding mechanism 9 of the present invention is used as a driving means of the ink sheet winding mechanism in the thermal transfer recording apparatus to prevent the intermittent winding of the ink sheet during the recording operation. However, according to the sheet material winding mechanism of the present invention, it is possible to absorb the torque fluctuation of the drive motor. Therefore, in the above-described thermal transfer recording apparatus, recording paper in the case of performing multicolor recording by superimposing recording of a plurality of colors When used as a take-up mechanism of 6, the recording paper 6
Can be wound with a stable torque, whereby the recording start position can be accurately adjusted. Like this
The sheet material winding mechanism of the present invention can stably convey the sheet material by applying the sheet material winding mechanism in the recording apparatus for winding and conveying the sheet material.

[0019]

As described above in detail, in the sheet material winding mechanism of the recording apparatus of the present invention, the friction shaft fixed to the rotary shaft of the drive motor and the friction shaft are engaged with the friction shaft. A gear portion composed of a cogwheel, a friction collar that engages with a gear of the gear portion via a friction pad, an elastic member that urges the friction collar to press the gear portion, and the elastic member is locked. And a stopper collar that is fixed to the friction shaft of the gear portion and further fixes this friction shaft to the rotation shaft of the drive motor, and meshes the gear of the gear portion with the gear that rotates the shaft that winds the sheet material, Since the sheet material is conveyed by rotating the drive motor, the friction clutch mechanism can be installed without providing a predetermined space in the recording device.
Further, since the friction clutch mechanism can be directly and detachably attached to the rotary shaft of the drive motor, the sheet material such as the ink sheet can be stably conveyed without requiring a large installation space for the drive mechanism. ,
This has an effect that maintenance work can be easily performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a sheet material winding mechanism of a recording apparatus of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of a sheet material winding mechanism of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a recording apparatus of this type.

FIG. 4 is an explanatory view showing a conventional sheet material winding mechanism.

FIG. 5 is a diagram showing a defect in a conventional recording apparatus.

[Explanation of symbols]

 1 Thermal Head 2 Platen Roller 3 Peeling Member 4 Guide Roller 5 Ink Sheet 6 Recording Paper 7 Ink Sheet Winding Mechanism 8 Recording Device Main Body 9 Ink Sheet Winding Mechanism

Claims (3)

[Claims] 1. A gear portion comprising a friction shaft fixed to a rotary shaft of a drive motor and a gear engaged with the friction shaft via a friction pad, and a gear portion of the gear portion engaged with the gear via the friction pad. A friction collar to be fitted, an elastic member for urging the friction collar to press the gear portion, and a stopper collar for locking the elastic member. A sheet material winding mechanism for a recording apparatus, characterized in that a gear is engaged and a drive motor is rotationally driven to convey a sheet material. 2. The sheet material winding mechanism for a recording apparatus according to claim 1, wherein the friction shaft is provided so as to be attachable to and detachable from the rotation shaft of the drive motor. 3. A recording device for pressing an ink sheet and a recording sheet against a platen roller by a thermal head to convey the ink sheet and the recording sheet and selectively drive the thermal head to perform recording, wherein a gear of the gear portion is provided. 2. The sheet material take-up for a recording apparatus according to claim 1, wherein the gear is engaged with a gear for rotating a shaft for taking up the ink sheet, and the ink sheet is taken up by rotationally driving the drive motor. mechanism.