JPS60245359A - Driving device of reciprocating running body - Google Patents

Abstract

PURPOSE:To suddenly start and suddenly stop a reciprocating moving body by providing clamped wires on both sides of a reciprocating moving body, driving this wire by the first and the second motors of a driving device containing a driving pulley, and also synchronizing both the motors. CONSTITUTION:A reciprocating running body is fixed to driving wires 12, 22 by the first and the second clampers 17, 27. When the first motor M1 rotates in the direction A, a moving pulley 14 moves in the direction A since both ends of the driving wire 12 are fixed to body anchors 15, 16, and the first clamper 17 also moves in the direction A. In the same way, the second clamper 27 moves by the second motor M2, too. The rotation of the motors M1, M2 is detected by rotary encoders 18, 28 provided on the first and the second motors M1, M2, and both the motors M1, M2 are controlled so as to rotate synchronously.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a wire drive device for an optical traveling body (carriage),
The present invention relates to a drive device for a reciprocating body that is applied to an inkjet printer, etc.

[Prior art]

As a recent driving device for a reciprocating body, for example,
No. 8-69852 and Japanese Unexamined Patent Publication No. 58-95762 are publicly known. The former has a configuration in which wires are connected to both sides of a reading body that integrates a lens and a CCD and is driven by a single motor, but the drive transmission path is long and complicated, and the drive shaft 33 that connects both wires is made thicker. This has the drawback of increasing inertia. In addition, the latter is a copying machine in which wires are connected to both sides of a ξ-lar traveling body that moves at a speed ratio of 2:1 and is driven by a single motor, but because the wire length is long, the wire stretches and becomes slack. It is easy to occur, so strong wire tension must be applied to prevent it from appearing.
It has drawbacks such as increased motor torque and increased structural strength. In addition, sliding bearings generally have better running characteristics than rolling bearings, but in that case a clearance for sliding is essential, but this clearance causes speed fluctuations between the driving side and the driven side. .

Therefore, in order to reduce speed fluctuations, it has been common practice to make the bearing spacing as long as possible.

Methods of applying frictional force or magnetic force to the driven side were used, but such static force alone has little effect.

〔the purpose〕

The present invention was made to eliminate the drawbacks of the conventional example, and its purpose is to connect wire loops to both sides of a reciprocating traveling body, drive them with separate motors, and electrically synchronize them. The purpose of this is to allow each motor to share the driving load of the traveling body and to enable rapid starting and stopping of the traveling body.Furthermore, another purpose is to reduce the load caused by the bearing clearance of the traveling body. The purpose is to push the play in one direction and eliminate speed fluctuations of the running object.

〔composition〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated based on the illustrated Example.

FIG. 1 shows a front view of an image reading device implementing the present invention.

In the figure, 0 is the original, 1 is the original glass, and 2 is the lamp (
3 is a first running mirror, 4 is a second running mirror, 5 is a third running mirror, 6 is a lens, and 7 is a sensor (eg, CCD). Also, A is the running direction, 2/,
a/, 4/, and s/ are each at the end of travel in the incoming direction. Indicates the condition.

In FIG. 1, an original 0 placed stationary on an original glass 1 is illuminated by a lamp 2, and its reflected light is transmitted to a first traveling mirror 3 and a second mirror 3.
The light is reflected by the traveling mirror 4 and the third traveling mirror 5, respectively, and is projected and imaged onto the sensor 7 by the lens 6. In the above optical system, the lamp 2 and the first traveling mirror 3 are the first traveling body (not shown).
The second traveling mirror 4,
The third traveling mirror 5 is both held by a second traveling body (not shown), moves in the incoming direction at a speed A in synchronization with the first traveling body, and scans the image of the document 0. This movement in the incoming direction is called sub-scanning. The sensor 7 photoelectrically converts the two-dimensional information of the document 0 using this sub-scanning and the main scanning (in the direction perpendicular to the paper surface) by the self-scanning of the sensor 7, and outputs an electric signal.

FIG. 2 shows a wire loop for driving a traveling body according to the present invention. A first drive shaft 1 is attached to the first motor shaft 1o of the first motor Ml.
1 is fixed. After winding the first drive wire 12 around the first drive wire 11 an appropriate number of times, the first drive wire 12 is wrapped around the first idle wire 1.
3, turned back to the left, went half around the first movable sled 14 rotatably fixed to the second traveling body, turned back to the right again, and fixed to the main body anchor 15. be done. The other of the first drive wires 12 is turned around the first movable pulley 14 by half a turn, then turned back to the left and fixed to the main body anchor 16 . The first drive wire 12 is clamped to the first traveling body between the first drive pulley 11 and the first movable sled 14 by a first cran nog 17. When the first motor Ml rotates in the input direction, the first drive wire 11 also rotates in the input direction, winds up the first drive wire 12, and moves the first crankshaft 17 in the input direction.
The first moving f-ley 14 also moves in the incoming direction at the speed A of the first cranometer 417. First drive shaft 10 of first motor M1
A tenth encoder 18 is fixed to detect the rotational speed of the first motor M1.

A second drive pulley 21 is fixed to the second motor shaft 2o of the second motor M2. The second drive wire 22 is wound around the second drive zori 21 an appropriate number of times, then half-circles around the second fiddle zori 23, turned back to the left, and then connected to the second drive wire 22, which is rotatably fixed to the second traveling body. Go around the moving pulley 24 halfway,
It is folded back to the right again and fixed to the main body anchor 25. The other end of the second drive wire 22 is turned back to the left after making a half-circle around the second movable googly 24 and fixed to the main body anchor 26. The second drive wire 22 is connected to the first running body between the second drive pulley 21 and the second movable spool 24.
? It is flanged at 27. When the second motor Ml rotates in the input direction, the second drive pulley 21 also rotates in the A direction, winds up the second drive wire 22, moves the second clamper 27 in the A direction, and also the second moving pulley 24 in the A direction. The second clamper 27 moves to A at a speed of A. Second drive shaft 20 of second motor M2
A 20th encoder 28 is fixed to detect the rotational speed of the second motor M2.

The two motors M1, M are suitably servo motors, but other motors can also be used.

Another embodiment is shown in FIG. It is almost the same as Fig. 2, but whereas the first motor M and the second motor M2 in Fig. 2 are the same (type, output, etc.), in the third region the first motor M, is the second motor M! It is set to a larger size. In both FIGS. 2 and 3, the first motor Ml is the main motor, and the second motor M2 is the sub or auxiliary motor.

FIG. 4 shows a diagram of the drive system having the configuration shown in FIG. 3.

The output of the tenth encoder 18 that detects the rotational speed of the first motor Ml is phase-compared with the output of the reference clock generation circuit 29 by the first phase comparator 30, and the first motor drive circuit 31 is activated based on the output. First motor V! is driven at a predetermined rotational speed. On the other hand, the second motor M! The output of the 20th-Talier 7:l-/28 which detects the rotational speed of the 10th-
The output of the Tary encoder 18 is phase-compared by the second phase comparator 32, and the output of the 20th Tary encoder 28 is compared with the output of the 10th Tary encoder 28.
- It is corrected by the second motor drive circuit 33 so that it is at the same position as the output of the tari encoder 18, and the second motor M2 is driven. The second phase comparator 32 is the tenth-tary encoder 18
Although the output signal of the reference clock generation circuit 29 is used as the reference, the output signal of the reference clock generation circuit 29 may be used as the reference. In this case, a synchronous motor would be appropriate. Furthermore, FIG. 5 shows another embodiment of the drive unit having the configuration shown in FIG. 3. The configuration is almost the same as that in FIG. 4, but the difference is that each has a reference clock generation circuit and the output signal of the Lohmeli encoder is compared with this.

The first reference clock generation circuit 29 outputs a signal with a frequency that determines the traveling speed of the traveling object, and the second reference clock generation circuit 34 outputs a signal with a frequency slightly higher than the frequency output by the first reference clock generation circuit 29 ( or lower) frequency.

In the configuration shown in FIG. 2.4, the first motor M1 and the second motor Mt are completely synchronized and drive the wires on both sides of the traveling body at the same speed. Therefore, the driving force of the running body is divided, allowing it to run at high speed.
It enables sudden starts and sudden stops (if the conventional one-motor one-side drive machine is a train pulled by a locomotive, the system of the present invention can be compared to a train).

The configuration shown in Figure 3.5 has a second motor M compared to the first motor M.
Since there is a slight difference in the rotational speed of the motor M, the traveling body on the side connected to the second drive wire 22 will be faster (or slower) by the speed difference than the side connected to the first drive wire 12. , the following is a unified explanation of the speed setting), but the output of the motor becomes M t >> M l, and the second motor M cannot affect the entire traveling body. serves to advance the second drive wire side of the short-distance traveling body, which corresponds to the gap (backlash) between the guide shaft and the traveling body bearing. In other words, by moving the traveling body with the gap pressed in one direction (as if the bearing clearance was realized), it is possible to prevent speed fluctuations of the traveling body due to the bearing gap, and to reduce jitter (JI).
It is possible to perform high-quality reading without TTER.

The double-sided drive allows the distance between the bearings of the traveling body to be shortened, and therefore has the effect of reducing the space in which the traveling body travels. FIG. 6 shows a block diagram of yet another configuration. 1st motor M□
, the second motor M1 is the same step motor, and is driven by a synchronizing signal from a common basic clock generation circuit 35. In this case, the first and 20th-Tary encoders/18.28 in FIG. 2 are omitted. can. Also, Figure 6 is the 4th
Compared to the block diagram in the figure, the phase comparator is omitted.

〔effect〕

The present invention consists of the configuration and operation as described above.
According to the present invention, (1) Wire Luso hooks are mounted on both sides of the reciprocating traveling body, which are driven by separate motors and driven electrically in synchronization, so that the traveling load is divided and handled by the motors; Enables the vehicle to suddenly start and stop.

(2) By using two motors of the same type and output and synchronizing one motor with the other, or by driving both motors with a common synchronization signal, the traveling body can move in unison. Furthermore, (3) both wires are set at a small speed and driven, and the bearing gap of the traveling body is pressed in one direction to make the traveling body travel, thereby eliminating speed fluctuations of the traveling body.

(4) The space between the bearings of the traveling body can be shortened to reduce the running space of the traveling body.

It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the inside of an image reading device to which the present invention is applied, FIG. 2 is a diagram showing a wire luzo driven by a traveling body according to an embodiment of the present invention, and FIG. 3 is another embodiment. 2, FIG. 4, FIG. 5(a), t(b), and FIG. 6 are drive control block diagrams according to different embodiments, respectively. Ml, M! ...First. Second motor, 12.22...
1st. Second drive wire, 11, 13, 14, 21°23
．． 24...Zori. Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A running body consisting of wires flanged on both sides of the running body that reciprocates along a guide shaft, and a wire loop that is passed through a plurality of wires, including a drive zori that connects the wire to a drive motor. In the drive device, the first
a first wire assembly including a first driving part connected to a motor; a second wire part including a second driving part connected to a second motor; A drive device for a reciprocating body, characterized in that it drives a first and a second phialuso. (2) The first motor and the second motor are of the same type and have the same output, and the second motor is synchronized with the output synchronization signal from the first motor or synchronized with the common synchronization signal with the first motor. A driving device for a reciprocating body according to claim (1), characterized in that the second wire loop is driven in synchronization. (3) Driving the traveling body, which is composed of wires flanged on both sides of the traveling body that reciprocates along the guide shaft, and a wire loop that is passed through multiple side sleds, including a drive sled that connects the wires to a drive motor. The device has a first wire loop including a first drive pulley connected to a first motor, a second wire loop including a second drive pulley connected to a second motor with a smaller output than the first motor, 2. The reciprocating body driving device according to claim 1, wherein each wire is driven with a slight difference between the moving speed of the wire and the second wire.