JPH0732073Y2 - Paper feeder for recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a paper feeding device for a recording device that feeds continuous recording paper onto a platen roller.

(Prior Art) When a continuous recording sheet is sandwiched between a recording head and a platen roller, and the recording sheet is fed by rotating the platen roller, only one motor is conventionally used to rotate the platen roller. It was For this reason, when converting the rotation speed from a low speed to a high speed in a wide range, a reduction mechanism including a large number of gears is provided, or a DC motor or a stepping motor capable of obtaining a wide range of rotation speeds is provided.

However, when the front and rear speed reduction mechanisms are provided, there are problems that the number of parts is large and the gears are large, and noise is generated due to meshing of gears. Further, the latter DC motors or stepping motors having a wide gear shift range have a problem of high cost.

(Problems to be Solved by the Invention) In the present invention, when a recording sheet is fed by one motor, which is a problem in the conventional sheet feeding apparatus for a recording device, if the reduction mechanism is used, the apparatus becomes large in size. It solves the problems that the number of points increases and that noise is generated during rotation, and that the cost increases when using a DC motor or stepping motor with a wide shift range, enabling low-cost, wide-range shift with low noise. An object of the present invention is to provide a small-sized paper feeding device for a recorder.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention is a sheet feeding device for a recording device, which rotates a platen roller supporting a recording sheet to feed the recording sheet. In the apparatus, two one-way clutches are attached to one shaft that rotates the platen roller, and a high-speed motor and a low-speed motor that rotate and drive the shaft in the same direction via the respective one-way clutches are provided. .

(Operation) According to the above configuration, the rotation of one of an inexpensive high-speed motor and a low-speed motor with a relatively narrow shift range is switched and transmitted to the rotary shaft of the platen roller via a one-way clutch, so that it is simple and compact. With this structure, the platen roller can be driven in a wide speed range.

(Embodiment) Hereinafter, an embodiment of a paper feeding device for a recording device according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, a platen roller 2 is rotatably supported via a rotary shaft 3 between opposite side walls 1 a and 1 b of the recorder body 1. The one end of the rotary shaft 3 protruding from the one side wall 1a has a first
Second gear fixedly mounted on a drive shaft 5 rotatably supported by the recorder main body 1 in parallel to the rotary shaft 3.
It meshes with the gear 6 of. The side walls 1a, 1 of the drive shaft 5
Timing pulleys 9 and 10 are fixed to both ends projecting from b via one-way clutches 7 and 8, respectively. On the other hand, the side walls 1a and 1b have a stepping motor 11 and a DC motor 1 respectively.
2 is fixed. A timing belt 14 is suspended between a pulley 13 fixed to the drive shaft of the stepping motor 11 and the timing pulley 9, and the driving force of the stepping motor 11 is transmitted to the drive shaft 5. . In addition, the third gear 15 fixed to the drive shaft of the DC motor 12
Engages with an intermediate gear 16 rotatably supported on the side wall 1b, and a pulley 17 is fixedly provided coaxially with the intermediate gear 16. And this pulley 17 and the timing pulley 10
A timing belt 18 is suspended between and. 19 is a recording paper 20 which is sandwiched between the platen roller 2 and the recording paper 20.
A thermal recording head for recording information on top.

Next, the operation of this embodiment will be described. Information is recorded on the recording paper supported by the platen roller 2 by the thermal recording head 19, and the recording paper is fed by the rotation of the platen roller 2. At this time, the recording paper feeding speed is high, for example, about 25 mm.
In the case of / sec, drive the DC motor 12 at low speed, for example, about 25
In the case of mm / min, the stepping motor 11 is driven. DC
When the motor 12 is rotating counterclockwise in the figure, the one-way clutch 8 is locked and the driving force of the DC motor 12 is applied to each power transmission element 15, 16, 17, 18, 18, 5, 6, 6. Each of the 4 is rotated in the direction of the arrow to rotate the platen roller 2 counterclockwise in the figure, and the recording paper 20 is sent out of the recording apparatus main body 1 at high speed. In this case, since the one-way clutch 7 is not locked, the timing pulley 9 does not rotate. Similarly, when the stepping motor 11 is rotating clockwise in the drawing, the one-way clutch 7 is locked and the platen roller 2 is rotated counterclockwise in the drawing. In this case, one-way clutch 8
Is not locked, the timing pulley 9 does not rotate. It should be noted that although the rotating direction is indicated by an arrow on each rotating element in FIG. 1, this indicates only the direction in which each element rotates, and does not indicate the state at a certain time. For example, the DC motor 12 rotates and the stepping motor
When 11 is stopped, timing pulley 9 is stopped, and when stepping motor 11 is rotating and DC motor 12 is stopped, timing pulley 10 is stopped.

According to the present embodiment, in accordance with the feeding speed of the recording paper 20, by switching to drive the DC motor 12 in the case of high speed, to drive the stepping motor 11 in the case of low speed,
A wide range of sheet feeding speeds can be obtained by using the inexpensive DC motor 12 and stepping motor 11 each having a relatively narrow shift range. As a result, a large reduction mechanism as in the conventional example is not required, the number of parts is small, and noise can be prevented.

In this embodiment, the paper feeding device of the thermal recording device has been described, but the present invention can be applied to other recording devices and similar effects can be obtained. The power transmission mechanism from each motor 11, 12 to the platen roller 2 is not limited to that shown in this embodiment. Furthermore, the platen roller 2 has the same effect when it is a driving roller.

[Advantages of the Invention] As described above, according to the present invention, the platen roller of the recorder is driven by switching to one of two motors of high speed and low speed through the one-way clutch, so that an inexpensive motor can be used. It has become possible to convert a wide range of paper feed speeds.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a paper feeding device for recording device according to the present invention. 1 ... Recorder main body, 2 ... Platen roller 3 ... Rotary shaft, 7,8 ... One-way clutch 11 ... Stepping motor 12 ... DC motor, 20 ... Recording paper

Claims (2)

[Scope of utility model registration request] 1. A paper feeding device for a recording device, which feeds the recording paper by rotationally driving a platen roller supporting the recording paper,
Two one-way clutches are attached to one shaft that rotates the platen roller, and a high-speed motor and a low-speed motor that rotationally drive the shafts in the same direction via the respective one-way clutches are provided. Paper feeding device. 2. A paper feeder for a recording apparatus according to claim 1, wherein the high speed motor is a DC motor and the low speed motor is a stepping motor.