JPS58201191A - Speed controller - Google Patents

Abstract

PURPOSE:To reduce the capacity of a desired value memory and to vary a speed immediately at need, by setting an intermediate jump pont and an intermediate start point in a desired speed pattern. CONSTITUTION:The period of an encoder 9 inputted according to the rotation of a DC servomotor 8 is detected by a period counter 10 and the period counted value is converted into a speed, which is compared with the desired speed in the desired speed memory 11. Their difference is made by a pulse width counter 12 into pulse width, which is passed through an amplifier 13 to vary the speed of the DC servomotor 8 accordingly. Those operations are carried out by executing microcodes in a microcode memory 14 by an ALU15. The intermediate jump point where a jump to another desired speed pattern can be caused before the speed attains to the desired speed and the intermediate start point where speed variation can be started at a specific speed are set in each desired-speed pattern in the desired value memory 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to control of sheet conveyance speed in optical character readers, mark readers, and the like.

Prior Art FIG. 5 shows all possible speed patterns between low speed V and high speed V, and six speed patterns are required as shown in this figure.

In the conventional method, all of the assumed speed patterns are treated as target speed patterns and stored in a target value memory, which has the drawback of requiring a large capacity. In addition, even if it becomes necessary to change the speed during acceleration/deceleration, there is a disadvantage that the speed cannot be changed until the sled speed pattern reaches a constant speed T (T). The purpose is to eliminate the above-mentioned conventional problems, and to provide a speed control device that has a small target value memory (and can change the speed immediately when the speed change is required). be.

The features of the present invention are that the target value memory is compressed,
In order to change the speed immediately at the point where it is necessary to change the speed, each target speed pattern has an intermediate jump point that allows you to jump to another target speed pattern in the middle of the target speed, and an intermediate start point that allows you to start from the middle of the target speed pattern. The goal is to jump between each target speed pattern and obtain the target speed.

Embodiments of the Invention Next, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 shows an example of speed control of an optical character reader which is an embodiment of the present invention and a side view of the device. Reading speed V
, cannot be achieved at high speed due to the capabilities of the reading head 1. Therefore, in order to improve the processing speed, speed control is performed such that the paper sheet speed at the reading head 1 is set to a low speed V7, and to a high speed V7 for other parts. In other words, the paper sheets 6 stacked in the hopper 2 are accelerated by a pickup roller 4 at a high speed VtK, pass through a paper sheet separation mechanism consisting of a separator roller 5 and a reverse belt 6, and are decelerated to a low speed V in front of the reading head. , after the reading is completed, it is accelerated again at high speed V, vc and is stored in the stacker 7.

FIG. 2 shows the leadware configuration for implementing this speed control. Detect the period of the encoder ν according to the rotation of the DC servo motor 8 from the period counter 1 OK, convert this period count to speed, and compare the four target speed tables in the target value memory 11. /< /l/
The pulse width is determined by the two-width cowl 7p12, and reflected on the speed of the DC servo motor 8 through the amplifier 16. These operations execute the microcode given as instructions in the microcode memory 14 to the ALU 15.
This is done by executing.

When the target speeds are two, V, , V, all possible target speed patterns are 0→l/ as shown in Figure 3.
, , Q-+V, , V, →V, , V2-+
Q, V, -+V, .

There are six target speed patterns: V, →0. Storing all of these target speed patterns in memory increases the capacity. Therefore, an intermediate start point 16 is provided at 21 points of the target speed pattern of O-+V, and V, →V, is used from the middle of the target speed pattern of 0 → V. Similarly, V, →
Intermediate start points 16 are provided at 10 points of the target speed pattern of 0, and V, →0 is used from the middle of the target speed pattern of V, →0. Therefore, as shown in Figure 4, o→'ty
O→V,,V,→0. There are four target speed patterns: V, →V, and the memory capacity constituting the target speed patterns can be compressed. Next, when changing the speed to V or 0 in the middle of 0 → V, the V of the target speed pattern of Q-+V
, , Vs, V4 points are provided with intermediate jump points 17, and target speed patterns V, →0, V2→V, K intermediate start points 16 are provided correspondingly. For example, when changing the speed between V and 23, to change to V, use the intermediate starting point 16 of the 21 points of the target speed pattern of V, → V, and use O
V to K! → Use the 21 intermediate starting points of the target speed pattern of 0. As described above, jumps can be made between each target speed pattern by setting an intermediate jump point 17 that allows jumping to another target speed pattern in the middle of the target speed, and an intermediate start point 16 that allows you to start from the middle of the target speed to each target speed pattern. and can immediately change to the target speed.

Effects of the Invention Since the #f structure is used as described above, the following effects can be obtained in the present invention.

1. Since the target speed pattern is reduced, the capacity of the target value memory can be compressed.

2. Since intermediate jump points and intermediate start points are provided in the target speed pattern, speed changes can be made immediately when a speed change is required.

[Brief explanation of drawings]

Figure 1 is an example of speed control and a side view of the device, Figure 2 is a configuration diagram of the hardware that implements speed control, Figure 5 is a diagram showing a conventional speed pattern stored in the target value memory, and Figure 4 is a diagram showing a conventional speed pattern stored in the target value memory. The figure is a diagram showing the speed pattern of the present invention stored in the target value memory. 1... Cutting head 2... Hopper 3... Paper sheet 4... Pick up roller 5... Separator roller 6... Reverse belt 7... Stacker 8... DC servo motor 9. ... Encoder 10 ... Encoder period counter 11 ... Target value memory 12 ... Pulse width output counter 16 ... Amplifier 14 ... Microcode memory 15 ... ALU 16
...Intermediate starting point 17...Intermediate jump point
1 Figure (0) 2 Figure 23 Figure? Figure 4

Claims (1)

[Claims] 1. By setting an intermediate jump defect that allows you to jump to another target speed pattern in the middle of the target speed, and an intermediate start point that allows you to start from the middle of the target speed pattern in each target speed pattern, you can jump between each target speed pattern and reach the target. A speed control device characterized in that it obtains a speed at which