JPS59101382A - Sheet feeding-in controlling system - Google Patents

Abstract

PURPOSE:To prevent skew feeding of a sheet from occurring and enable to stably feed the sheet, by a method wherein feeding rollers for feeding a sheet to a printing part are rotated at a low speed for a predetermined period of time from the time of inserting the sheet, and thereafter the rotating speed of the rollers is rapidly accelerated to a predetermined value. CONSTITUTION:In a sheet printer wherein a pair of feeding rollers 5 pressed against each other are provided at a sheet inserting port and the sheet 1 is fed to a position between a printing head and a platen 12 by the rollers 5, the rotating speed of the rollers 5 is accelerated from the time of inserting the sheet until a predetermined low speed V1 is reached, then the low speed V1 is maintained for a predetermined period of time, and thereafter it is accelerated to reach a predetermined high speed V2. Accordingly, by rotating the rollers 5 at the low speed for the predetermined period of time in the beginnging, the sheet can be clamped by the rollers 5 accurately and stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a form suction control method for a printer or the like, and particularly to form suction speed control at the start of form suction.
2゜ [Prior Art] In conventional printer devices, a sensor detects that a form has been set, and this triggers the motor to rotate.
Forms are sucked in by a feed roller linked to a motor. At this time, the motor is accelerated at once from the initial stage of operation until it reaches the target speed.

A conventional form suction control system will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows an outline of a printer device. 1 is a ledger,
2 is a table for setting form 1), 3 and 4
5 is a feed roller for conveying the form 1; 6 is a motor for rotating the feed roller 5; 7 is a control circuit for controlling the motor 6; 9 and 10 is a frame for guiding form 1, 11 is a print head for printing on 1llj & form 1, and 12 is a platen.

Next, the form suction operation of the printer device will be explained. The form l is placed on the table 2 and pushed out towards the feed roller 5. At this time, send Rone.

When the upper end of the form l reaches the position of the sensor 3 provided in front of the form l, the sensor 3 detects the setting of the form l, and this triggers the control of the control circuit 7 to drive the motor 6. The form 1 is conveyed by the rotation of the feed roller 5 in conjunction with the rotation of the feed roller 5. When the form 1 conveyed between the feed rollers 5 reaches the position of the sensor and the upper edge of the form 1 blocks the sensor 4 from light, the signal is sent to the control circuit 7, which controls the motor 6 after a predetermined period of time has elapsed. control to stop the operation. 10 Here, at the time of starting the motor drive described above.

Motor speed control is performed as shown in FIG. That is, control is performed so that the speed A at the start of motor drive is accelerated all at once until the target speed C is reached. Therefore,
Even when the feed roller 5 does not securely sandwich the form l, it is rapidly accelerated.

There were problems with the setting of the form, such as the form 1 being tilted and the printing being slanted.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional drawbacks and to provide a form suction control system with excellent form setting properties.

[Summary of the invention]

In order to achieve the above object, the present invention rotates the feed roller at a lower speed than the target speed when the feed roller is pinching the form, and after the feed roller has surely pinched the form, the feed roller rotates the feed roller at a speed lower than the target speed. l: Accelerates to target speed.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram of an embodiment of the present invention. The difference from FIG. 1, which shows the conventional example, is that a memory circuit 8 is added. A procedure for controlling the motor is stored in the memory circuit 8, and the control circuit 7 controls the motor 6 in accordance with this procedure.

By the way, the control procedure for this motor 6 is such that it is programmed so that the feed trap rotation speed becomes an acceleration diagram as shown in FIG. That is, the speed B is considerably lower than the target speed C.
After being accelerated until reaching .

It maintains a constant speed state at speed B for a certain distance, rotates at constant speed B for a certain distance, and then accelerates until it reaches target speed C.

What is characteristic here is that the acceleration itself changes from speed A to speed B in the conventional example and in this embodiment, as is clear from the fact that the slopes in FIGS. 2 and 3 are the same. This means that it is the same when accelerating from speed B to speed C. Therefore, the performance of the motor used in this embodiment may be exactly the same as that of the conventional motor.
10 Next, the control of the motor 6 for performing the operation shown in the acceleration diagram of FIG. 4 will be explained with reference to the flowchart shown in FIG. 5.

When the form 1 is set and the upper end of the form 1 is exposed to light by the sensor 3, this triggers the motor 6 to be driven, and unless the light shines, the motor 6 will not be driven (501). When the motor 6 is driven, the motor 6 is accelerated at a constant acceleration until it reaches the speed B (502). As a result of acceleration, when the speed reaches B, from then on it enters a constant velocity state of speed B,
Fast pho.

Determine whether or not it has moved within a certain distance in B (5
03). After moving for a certain distance at a constant speed of speed B, it accelerates again at a constant acceleration until it reaches the target speed C (504)
. After reaching the target speed C, ・Speed C without accelerating
, and the form 1 is further sucked in. After continuing the operation at a constant velocity C, the sensor 4 is moved to the upper end of the form 1 (505), the form 1 is positioned relative to the printing pad 11, and the motor 6 is stopped (506). After one printing is performed using the printing pad 11 and the platen 12, the form 1 is ejected and the operation is completed.

Note that in the following explanation, the distance for operating at constant velocity B and the distance for operating at constant velocity C are not specified, but these may be changed depending on the device such as a printer to which this embodiment is applied. It is also possible to change the same device according to the usage pattern of the user. Furthermore, the speed B
It is also possible to change the speed C and the speed C.

〔Effect of the invention〕

As explained above, according to the present invention, no matter how high the target @1 large speed is, the suction speed is always stable because the suction speed is kept constant at a low speed when the form is caught on the feed roller. It is possible to obtain the set property of the form,
A form suction control method with excellent form setting properties can be realized.

[Brief explanation of drawings]

Figure 1 is a diagram showing the configuration of a conventional printer device, Figure 2 is a diagram showing the acceleration state of a conventional form feed roller, Figure 3 is a diagram showing the configuration of an embodiment of the present invention, and Figure 4 is a diagram showing the configuration of a conventional printer device. 5 is a diagram showing the acceleration state of the form feeding J-reroller in one embodiment of the present invention, and FIG. 5 is a diagram showing the control flow of the form feeding roller in one embodiment of the present invention. l: form, 3.4: sensor, 5: feed roller 1. . 6: Motor, 7: Motor control circuit, 8; Memory surface 1゜th
1 Figure 1 to Figure 2 Distance Figure 3 Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] α) In a form suction control method in a form handling device that handles forms, the driving means for form suction is accelerated from the start of driving until it reaches a set speed, and after reaching the set speed,
1. A form suction control method, characterized in that the device is moved at a constant speed for a predetermined distance, and then accelerated again to reach a target speed after moving at a constant speed for the predetermined distance. (2) The form suction control according to claim 1, wherein the period in which the operation occurs between the predetermined distances and at the target speed is set to a distance depending on the type and manner of use of the form handling device. method. 15