JPH0212754B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention provides a paper feeding device for a printer that feeds paper by driving a pulse motor. At the same time, during manual manual feeding, energizing the motor is energized to provide a daytent based on electrical control to make the manual feeding operation more effective, and the amount of daytent during manual feeding can be adjusted to the minimum paper feed of the pulse motor. The present invention relates to a paper feeding device that can be set to N times the amount of rotation (N is an integer) corresponding to the amount of rotation so that the detent effect during manual feeding can be made more effective.

<Prior Art> Recently, as one of the demands for increasing the functionality of equipment such as typewriters, it has been required to reduce the minimum paper feed amount by the paper feed device. ) 1/12″, 1/24″, 1/16″, 1/3 which are 1/2, 1/4 respectively from the feed
A feed of 2" is required. In order to satisfy all these feed requests, a feed of 1/96" is required as the minimum paper feed amount by the pulse motor.

When paper is fed by pulse motor drive, a four-phase pulse motor is normally used as shown in FIG. 5, and four steps (for example, A→B→→→A )
These four steps are made to correspond to the above-mentioned minimum paper feed amount of 1/96'' to satisfy various feed requests.

To explain this point in more detail, if the number of motor steps is 192 steps/rotation as shown in Figure 5, and the paper feed amount is 1/384'' per step, then this is the A phase. Control with 4
When step driving, the feed amount is 4/384 = 1/96'', and the stop is always in the A phase. Looking at this on the motor shaft, it becomes 1/192 x 4 = 1/48, or 1/48 rotation.

On the other hand, if the platen shaft is not structured to provide a mechanical detent during manual feeding by manually feeding a knob attached to one end of the platen shaft, a detent based on electrical control is provided by controlling the energization of the motor. In this case, the detent is normally operated in units of the above-mentioned minimum paper feed amount (1/96"). In other words, on the motor shaft, every 1/48 rotation of 4 steps (A→B→→→A) The day tent is working.

However, since this manual feed involves rotating the knob by hand, the above daytent spacing (1/48 rotation) is too small and is equivalent to having no daytent for manual operation, so it does not fully function as a daytent. The current situation is that there is no one.

Therefore, paper feeding devices that can reduce the minimum paper feeding amount using a pulse motor and have high positioning accuracy, and that are easy to operate during manual operation, that is, can provide large detent intervals based on electrical control, are currently in high demand. desired. Moreover, it goes without saying that the setting of the detent can be achieved by simple means.

<Purpose> The present invention aims to improve positioning accuracy by reducing the minimum paper feed amount by a pulse motor, and at the same time to reduce the interval between day tents in order to effectively provide a day tent based on electrical control during manual operation. Paper feed that improves manual feed operability by allowing the setting to be N times (N integer) the motor rotation amount (1/48 rotation) corresponding to the minimum paper feed amount (1/96″) using a simple method. The purpose is to provide a device.

In particular, in the present invention, the rotating shaft of the pulse motor is provided with a rotary plate having a slit and a photocoupler provided in relation to the rotary plate, and the output from the photocoupler controls the energization of the pulse motor. The interval can be adjusted and set to N times the above.

<Example> Fig. 1 is a diagram showing the relationship between the rotating shaft surface of a pulse motor and a slit disk (rotary plate) attached to the rotating shaft of the motor, and Fig. 2 is a diagram showing the relationship between the rotating shaft surface of a pulse motor and a slit disk (rotary plate) attached to the rotating shaft of the motor. FIG. 3 shows a circuit for controlling energization of the pulse motor based on the output of a photocoupler provided in relation to the slit disk. FIG. 3 is a diagram showing the configuration.

First of all, Figure 1 shows the rotational axis of a 4-phase pulse motor with a motor step number of 192 steps/rotation and a paper feed amount of 1/384'' per step. In order to prevent the phase shift of the motor, the A phase is energized and the minimum paper feed amount is 4 steps (A→B→→→A).
4" x 4).

In other words, on this motor shaft, 1/192 x 4 = 1/48
The rotation corresponds to a minimum paper feed amount of 1/96", and the paper feed can be 1/12", 1/24, 1/16", or 1/32".

A detent is given every 1/48 rotation corresponding to this minimum paper feed amount of 1/96'', but as described in the conventional example, in the case of manual feeding, this interval is almost non-existent.

Therefore, in the present invention _, a rotary _plate with slits, that is, a slit disk 1 as _shown in FIG _.
The detent operates at positions a ₄ , a ₅ , etc.

This reduces the paper feed amount by 1/1 in one daytent interval.
2", the minimum paper feed amount above is 1/9
The feed amount is 8 times that of 6". Looking at this on the motor shaft, since the minimum paper feed amount (1/96") is 1/48 rotation, it is 1/48 x 8=1/6
Then, the motor rotation corresponding to the minimum paper feed amount (1/96″) is given by giving six day tents (a ₀ , a ₁ , a ₂ , a ₃ , a ₄ , a ₅ in Figure 2) per motor rotation. Amount (1/48
The spacing is 8 times that of rotation).

Therefore, the slit disk 1 is rotated by the motor.
Slits 2 _-0 , 2 _-1 to 2 corresponding to the positions of a ₀ to a _5
-5 is provided, and slits 2 _-0 to 2 of this disk 1 are provided.
_-5 is detected by a photocoupler installed at the a ₀ position, and the daytent is activated by controlling the A-phase energization at the relevant slit position and disabled at other positions (Figure 3). It is possible to have a large effect on the interval of 1/6 turn (8 times the above-mentioned 1/48 turn).

To explain the circuit configuration of FIG. 3 that performs the above control, 3 is a driver for a 4-phase (A, B, .) pulse motor, and each of the 4-phase coils is connected to a switching element 4 _-1 , 4 _-2 , 4 _-3 and _4-4 , and each of the switching elements _4-1 to _4-4 is driven by pulse drive signals A, B, . . . inputted via AND gates _G1 to _G4 . Reference numeral 5 denotes a drive system for a photocoupler including a light emitting element 6 and a light receiving element 7.

The light receiving element 7 receives light from the light emitting element 6 when it corresponds to each of the slits 2 _-0 to 2 _-5 of the slit disk 1, and when it does not correspond to each of the slits 2 _-0 to 2 _-5 . The light from the light emitting element 6 is blocked by the disk 1, so that the light receiving element 7 cannot receive it. Then, the light receiving element 7
When it receives the light from the light emitting element 7, it outputs "1" to the output line D via the inverter I, and is input to the OR gate OR.

In addition to the output of the output line D, a switching signal S is input to the input side of the OR gate OR, and the output of this gate OR is input to the other input terminal of each of the AND gates _G1 to _G4 . It is connected.

The switching signal is binary (“H”) in response to the switching means.
and "L" level), and is set to "H" level when paper feeding is performed by a pulse motor, and set to "H" level when manual paper feeding is performed.

That is, when paper feeding is performed by pulse motor drive, by setting the switching signal S to "H" level, each AND gate G ₁ of the driver 3 is switched on regardless of the state of the output D from the light receiving element 7 side. ~
G ₄ is enabled, and pulse drive signals A, B,
By giving A, the drive is performed every 4 steps as A→B→→→A, and the minimum paper feed amount is 1/9.
6", the minimum paper feed amount of this pulse motor is 1/
Paper feed control such as 1/12'', 1/24'', 1/16'', and 1/32'' can be performed based on 96''.

On the other hand, in the case of manual feeding, the switching signal S is set to "L" level, so that the output line D becomes "H" at the timing corresponding to each slit 2 _-0 to 2 _-5 of the slit disk 1 when the light receiving element 7 ” level, and at this time each AND gate of driver 3
_G1 to _G4 are valid.

For this reason, the light receiving element 7 is connected to the slit 2 _-0 in FIG.
A-phase energization is performed at the timing when the drive pulse A is output in a state corresponding to ~ _2-5 , and a detent is provided. In other words, the detent acts only at each position a ₀ to _{a 5} in Fig. 2, and at other positions each AND gate G ₁ to G ₄ is closed, so the drive pulse A output every 4 steps Daytent is enabled.

As a result, during manual feed, 1/48 of the motor shaft
An electric daytent is applied every 1/6 rotation, which is 8 times the rotation, and can provide an effective daytent for manual operation.

On the other hand, as shown in FIG. 4, if a 24-step pulse motor is used to provide the slits in the slit disk 1 as shown at 2 _-6 , 2 _-7 , and 2 _-8 , then a ₀ , a ₂ , a ₄
The detent can be applied at the position , that is, the detent can be applied every 1/3 of the time.
Note that 5 is a photocoupler.

<Effects> In the paper feeding device of the present invention, it is possible to reduce the minimum paper feeding amount by the pulse motor, thereby improving the paper positioning accuracy, and also to improve the paper positioning accuracy by using a simple configuration means during manual operation. It is characterized in that a detent can be effectively provided at N times the amount of motor rotation corresponding to the minimum paper feed amount, and that the operability of this manual operation can be improved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of the rotating shaft surface and the slit disk of the pulse motor of the device of the present invention, and Fig. 2 is a diagram showing the rotating shaft surface of the pulse motor showing the position where the detent is applied based on the slit disk. Figure shown, 3rd
FIG. 4 is a diagram showing the control circuit configuration of the same device, FIG. 4 is a diagram showing another embodiment of the slit disk, and FIG. 5 is a diagram showing the rotating shaft surface of the pulse motor of the conventional device. 1... Slit disk, 2 _-0 to 2 _-5 ... Slit, 3... Pulse motor driver, 4 _-1 to 4
_-4 ... Switching element, 5... Photocoupler drive system, 6... Light emitting element, 7... Light receiving element, G ₁
~G ₄ ...and gate, OR...or gate, S
...Switching signal.

Claims (1)

[Scope of Claims] 1. A paper feeding device for a printer that controls paper feeding by driving a pulse motor, comprising: a rotating plate attached to the rotating shaft of the pulse motor and having a slit around the periphery; It is equipped with a light emitting and light receiving element arranged to detect the slit, and a drive pulse to be input to the driver circuit of the pulse motor is introduced through a control gate, and the control gate further controls paper feeding by the pulse motor and manual control. A slit of a light-emitting and light-receiving element for constantly operating the gate effectively when paper is fed by the pulse motor and detecting the slit when paper is fed by manual operation in response to a means that is switched and set depending on the paper feed by manual operation. At the time of detection, the gate is controlled by a circuit means that effectively operates the gate, and the slit position of the rotary plate is controlled by a rotation amount N corresponding to a preset minimum paper feed amount of the pulse motor.
(N is an integer), and the control gate is enabled at the timing of the slit position when paper is fed by manual operation, and the detent action by the pulse motor is applied at a predetermined phase of the drive pulse. A printer paper feeding device featuring: