JPH0254235B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device for facsimile and the like.

Conventionally, in a facsimile machine, the reception and recording system performs reception and recording while drawing out and conveying a roll of recording paper using a platen roller rotated by a drive motor and a recording head.
In this case, in order to expose the holder portion so that the roll of recording paper can be replaced when it runs out, a platen roller is usually provided in the opening unit and a drive motor is also attached. However, if the drive motor is also provided on the open unit side, it will be heavy and have poor operability, so there are some devices in which the drive motor is also provided inside the main body of the apparatus in the same way as the recording head. Japanese Utility Model Application Publication No. 55-138546 discloses that the driving connection is performed by gears. However, in this method, the feeding accuracy of the recording paper tends to deteriorate due to the influence of backlash, and problems tend to occur during meshing.

The present invention has been made in view of the above points, and improves the opening/closing operability of the opening unit, and
It is an object of the present invention to provide a recording device that can satisfactorily transmit drive to a platen roller.

The present invention has a configuration in which the recording head and the drive motor are placed inside the apparatus main body, and the platen roller is placed in the opening unit, so that the opening and closing operation of the opening unit is ensured under light weight, and the drive system of the platen roller is The combination of the intermediate shaft, first and second levers, and first and second belts allows power to be transmitted in the same state at all times.

An embodiment of the present invention will be described based on the drawings.
This embodiment is applied to a facsimile reception and recording system, and an outline of the facsimile is shown in FIGS. 1 and 2. First, a document table 2 is formed on the front upper surface of the apparatus main body 1, and a document tray 3 is formed on the rear upper surface, and a document transport path 5 is formed to transport the document from the document table 2 to the document tray 3 via a bridge section 4. has been done. Here, inside the bridge part 4, there are a pair of transport rollers 6, 7 and a target glass 8.
It is equipped with a fluorescent lamp 9 that irradiates light onto a document being conveyed on a target glass 8, a first mirror 10, a first mirror 11, and a lens 12 that receive reflected light from the document. (Charge
-coupled device) 13. This CCD 13 is attached to a video preamplifier unit board 14, and a transmission connection system 15 is constituted by these.

On the other hand, on the front side of the device main body 1 is a document table 2.
A reception recording system 16 is provided at the bottom. The main elements of this reception recording system 16 include a roll of recording paper 17, a thermal head 18 serving as a recording head, a platen roller 19 that can move toward and away from the thermal head 18, and is rotated by a step motor (described later), and cutter teeth 20. A recording paper transport path 21 is formed for discharging the rolled recording paper 17 from the lower side to the upper front side. That is,
The inner circumferential surface of the roll of recording paper 17 is the recording surface, and is received and recorded by the thermal head 18 while being drawn out and conveyed by the platen roller 19. After the recording paper is finished, the recording paper is pulled upward toward the front side to open the cutter teeth 20. It is to be cut with.

Note that 22a is a power supply unit, and 22b is a system control unit.

Here, details of the reception recording system 16 are shown in FIGS. 3 to 6. First, an arc-shaped recording paper holder 24 is provided in the apparatus main body 1, and is positioned on a bottom plate 23, into which the rolled recording paper 17 is dropped and held. Further, an opening unit 28 is provided which includes a front cover 25 and a side plate 26 and is rotatable toward the front side of the apparatus main body 1 about a fulcrum shaft 27 attached to the main body frame of the apparatus main body 1. The side plate 2 of this opening unit 28
A roller shaft 29 of a platen roller 19 is supported between the rollers 6 and 6 via a bearing 30. Also, a guide plate 31 is provided between the platen roller 19 and the front cover 25.
is provided. On the other hand, the thermal head 18 and the cutter teeth 20 are provided in a fixed position using a stay or the like on the apparatus main body 1 side. moreover,
A bracket 3 is provided with a step motor 32 as a drive motor for rotating the platen roller 19, which is mounted on the main body frame and positioned outside the side plate 26.
It is fixed at 3.

Therefore, the motor shaft 34 of the step motor 32
protrudes outside the side plate 26, and the side plate 2
6. A movable intermediate shaft 35 is provided between the brackets 33. And motor shaft 3
4 and the intermediate shaft 35, and a second lever 37 that connects the intermediate shaft 35 and the roller shaft 29.
is provided to support the intermediate shaft 35. That is, the first lever 36 is connected to the motor shaft 34 and the intermediate shaft 3.
5, the second lever 37 can be rotated by the intermediate shaft 35 and the roller shaft 29, the side plate 26 can be rotated by the fulcrum shaft 27 and the roller shaft 29, and the device main body 1 side is rotatable by the motor shaft 34 and the fulcrum shaft. If we think of it as a fixed node with 27, it becomes a four-clause link. Here, a stopper 38 for receiving the first lever 36 is formed at the tip of the first lever 37 on the intermediate shaft 35 side.
A pulley 39 is fixed on the motor shaft 34, a two-stage pulley 42 having a large pulley 40 and a small pulley 41 is mounted on the intermediate shaft 35 via a bush 43, and a pulley 42 is mounted on the intermediate shaft 35 via a bush 43. Pulley 4
4 is fixed. A first belt 45 is stretched between the pulley 39 and the large pulley 40, and a second belt 46 is stretched between the small pulley 41 and the pulley 44. Furthermore, looking at the relationship between the motor shaft 34 and the first lever 36, the first lever 36 has an elongated hole 47 through which the motor shaft 34 can pass, and an adjustment mechanism that is attached to the motor shaft 34 by a bearing 48. A plate 49 is provided, and is fixed to the first lever 36 with screws 51 through elongated holes 50 formed in the adjustment plate 49. Here, the screw hole 52 of the first lever 36 is connected to the adjustment plate 49,
Bearing 48 to improve the adhesion of first lever 36
It is formed in a half-opening part that is formed taking into consideration the flange thickness. Furthermore, the relationship between the roller shaft 29 and the second lever 37 is basically the same, and the second lever 37 has an elongated hole 54 through which the roller shaft 29 to which the spacer 53 is attached can pass, and
An adjustment plate 56 is provided which is attached to the roller shaft 29 by a bearing 55, and is fixed to the second lever 37 with a screw 58 through an elongated hole 57 formed in the adjustment plate 56. 59 is a screw hole.

In such a configuration, the rolled recording paper 17
When replacing the opening unit 28, the opening unit 28 is rotated toward the front about the fulcrum shaft 27 as shown by the dashed line in FIG. As a result, the recording paper holder 24 is exposed, so a new roll of recording paper 1 can be used.
7 onto this recording paper holder 24 and hold it there, and the leading end side can be easily set by simply placing it on the platen roller 19. In this case, the rolled recording paper 17 is held down, but
Since the inner circumferential surface side that does not contact the recording paper holder 24 is the recording surface, there is no problem. In addition, the release unit 28
The open state is maintained by the second lever 37 being engaged with the stopper 38 of the first lever 36 (the closed state is maintained by a lock mechanism not shown). Therefore, in the opening operation of the opening unit 28, this opening unit 28
Since only the platen roller 19 and the like are installed and no step motor 32 and the like are attached, the operation can be performed with good operability under light weight conditions.

Looking at the power transmission between the step motor 32 and the platen roller 19, the first lever 36,
The same drive transmission state is always ensured by the first belt 45 and second belt 46 corresponding to the second lever 37, and the step motor 32 and platen roller 19
Even though they are fixed separately, stable driving of the platen roller 19 can be ensured. By the way, the first belt 45 and the second belt 46
When using the tensioner, the tension becomes a problem, but it can be adjusted using adjustment plates 49 and 56, respectively. for example,
Looking at the first belt 45 side, the adjustment plate 49 is positioned on the motor shaft 34 via the bearing 48, and the adjustment plate 49 is positioned by the elongated holes 50, 47.
9 and the first lever 36 are movable in their longitudinal directions, and may be fixed with screws 51 after adjustment. Although tension rollers can be used in place of the adjustment plates 49 and 50, they are more expensive than the present embodiment in terms of bearing retention, number of parts, etc.

Note that FIG. 7 shows a modification of the adjustment plate 60, in which the bearing 61 is integrally formed of a copper-based oil-impregnated sintered part or the like to reduce costs.
According to this, it is not necessary to partially remove the screw hole 52 portion of the first lever 36 (or the second lever 37).
In addition, the motor shaft 34 serves as a tension adjustment means.
Alternatively, the adjustment may be performed using an adjusting plate or the like on the intermediate shaft 35 side with the roller shaft 29 side as a reference.

As described above, the present invention has a basic configuration in which the recording head and drive motor are attached to the apparatus main body side, and the platen roller is attached to the opening unit side, thereby ensuring improved operability while reducing the size and weight of the opening unit. A first system that regulates the position of the drive connection between the drive motor and the platen roller and interposes an intermediate shaft.
Since this is carried out using the first and second belts corresponding to the two levers, a stable drive transmission state can always be obtained and accurate recording conveyance can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of the overall appearance of the device, FIG. 2 is a schematic vertical side view thereof, and FIG. 3 is a vertical side view showing an enlarged view of the main parts. , FIG. 4 is a side view showing the power transmission system, FIG. 5 is a horizontal sectional view when opened, FIG. 6 is an exploded perspective view of the tension adjustment mechanism, and FIG. 7 is an exploded perspective view showing a modification. 1...Device main body, 17...Rolled recording paper, 1
8...Thermal head (recording head), 19...
Platen roller, 27... Fulcrum shaft, 28... Opening unit, 29... Roller shaft, 32... Step motor (drive motor), 34... Motor shaft, 35
... intermediate shaft, 36 ... first lever, 37 ... second lever, 45 ... first belt, 46 ... second belt.

Claims (1)

[Claims] 1. A recording head is provided in the path of the recording paper in the apparatus main body, and a drive motor is fixedly provided on the side of the apparatus main body, and the opening unit is rotatable about a fulcrum shaft with respect to the apparatus main body. A platen roller for moving toward and away from the recording head is rotatably attached to the release unit, one end of a first lever is rotatably attached to the motor shaft of the drive motor, and a second lever is rotatably attached to the motor shaft of the drive motor. One end of the two levers is rotatably attached, the other ends of the first lever and the second lever are rotatably connected by an intermediate shaft, and a pulley fixed to the motor shaft and the intermediate shaft are connected to each other. A recording device characterized in that a rotatably mounted two-stage pulley is connected by a first belt, and the two-stage pulley and a pulley fixed to the roller shaft are connected by a second belt.