JPS5874928A - Brake for moving body - Google Patents

Abstract

PURPOSE:To make simple and compact the structure of a brake for the moving member of a copying machine or the like, by installing swing members in positions to stop the moving member and by providing the swing members with bias means and causing the swing members to receive the moving member during its movement. CONSTITUTION:Brakes A, A are provided in positions corresponding to the ends of reciprocation of a reciprocated optical scanner 1. Levers 4, 4, which swing about fixed shafts 5, are provided on a machine frame F. When the scanner 1 which is moved forward (a) and backward (b) performs inertial movement, the scanner first collides against the horizontal shaft 8 (81) of the lever 4 so that the lever swings about the shaft 5 against a tension spring 7 while elongating it. At that time, the scanner 1 is decelerated by the reaction force of the spring 7. The braking force acting on the scanner 1 due to the elongation of the spring 7 increases nonlinearly so that the characteristic curve of the braking of the scanner 1 in the first stage is slow and the length l of the braking to the stoppage is small.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the movement end portion KtI of a document loading table in an optical scanning member of a moving layer in a copying machine, image reading stack, etc.
Effective for adjusting the braking device of a moving body to be effective when stopping without stopping with low strain.

Figure 91 is a schematic O oblique view of the reciprocating optical scanning body part of a copying machine or image reading device Km, where l is the optical scanning body, and the risk of peeling is the board, and the assembly is Although the details are omitted in the figure, the optical scanning body 1 has two guide rails 2 in the left and right directions.
It is supported by the rail 2 and can freely slide in the left and right directions along the rails 2 and 2, and is always on standby with the left end of the rails 2 and 2 as the home position. AM drive 1 to the right side, rail right end side O forward movement end point K
When I move back, I return to the home position on the left end of the rail and wait. The reciprocating movement drive mechanism of the optical scanning body I is omitted from the figure, but is generally constructed using a forward/reverse attachment I and a chain in the tension choir 3.

A Kuharaho mounting table (
(omitted in the figure) above the image plane *K, or an optical scanning body'
By placing and setting a document with the image surface facing downward 11 on a transparent plate-side document-placing table (not shown) disposed above 1, and driving the optical scanning body 1 back and forth. Optical scanning body 10
During the forward and backward movement, the document surface is sequentially copied or read from the left side to the right side, or from the right side to the left side.

However, in the above-mentioned apparatus, when the process execution speed is to be increased as much as possible in response to the demand for higher speed, the following problem arises regarding the reciprocating body (9) and the optical scanning body (1).

That is, when the reciprocating motion of the optical scanning body 1 is increased, the acceleration and deceleration of the optical scanning body 1 at both ends of the reciprocating movement of the optical scanning body 1011'' (hereinafter referred to as the forward movement end and the backward movement end) becomes more aggressive. , at the 9th point, the optical scanning body 1 reaches the backward movement end, and at 9th and 11th, when the backward movement reaches the forward movement end again, a large deceleration → stop occurs.The shock causes vibrations and 4. The generation of noise can be adversely affected by the image quality (copying/reading/composting) and the reading accuracy. Although the shock can be alleviated (1), the purpose of increasing the speed cannot be achieved and the entire device becomes bulky (due to the presence of an even longer overrunning length).

The above-mentioned space is similar to the deceleration and stopping of the document table reciprocating lid at the end of the movement of the document table in copying machines, image reading sand devices, etc., and various moving bodies in various other devices. I can say that.

In the past, various devices and mechanisms have been proposed to alleviate such acceleration/deceleration shocks, but they are extremely complex and bulky, so it is difficult to say that they are practical.

The present invention decelerates and then stops a moving body with as short an overrunning length as possible and with low shock even when it reaches a stopping point at high speed, absorbs and stores the deceleration energy, and A fifth object of the present invention is to construct such a moving body moving device with a simple structure and a small size so that the stored energy can be used as acceleration energy for starting the movement of the moving body again. .

That is, an s@ that can freely swing around an axis on one end side is arranged at a location where the moving object is to be stopped, and a biasing means is connected in series to the swinging member, so that the free lower part of the swinging member is connected to the swinging member in series. The swinging member and the biasing means are arranged so that the movable member and the biasing means are arranged in a substantially straight line, and the linear arrangement line thereof is substantially orthogonal to the moving direction of the moving body. By having the moving body which is still moving and has reached the stop point be received by the swinging member, the moving body is caused to swing backwards against the biasing means about the axis of the swinging member. Initially, the vehicle decelerated to a stop using a gentle non-linear braking curve.
The gist of this paper is a braking device for a moving body that is characterized by this.

In the example in FIG. 1, the moving body is reciprocating m1. Since the optical scanning body 1 is of the type shown in FIG. Although FIG. 2 shows the device on the forward moving end side, the device on the backward moving end side also has the same configuration. That is, reference numeral 4 is a swinging member whose upper end is supported by a shaft 5 fixed to the fuselage frame 5F beside one of the guide rails at the forward end of the optical scanning body. Oscillation, 1 & free swinging lever, 6 is an abbreviation of the support shaft 5 of the vertical V par - the spring hook installed directly below the fuselage frame PK is metal, 7 is the lever, - the free end of the lever as a biasing means The spring hook is stretched between metal A6 and is a nine-tension spring. l! Therefore, the optical scanning body 1 is in a free state in which it is not involved. Further, the linear array lines are substantially perpendicular to the moving direction of the optical scanning body 1, and have a nine relationship. Reference numeral 8 denotes the free end of the lever 4 as a contact with the optical scanning body 1, and the horizontal shaft is provided with the base firmly fixed and the distal end protruding centrally into the movement path of the optical scanning body 1. In the embodiment shown in FIG. The optical scanning body 1 is fitted with a rotary shaft 81 rotatably on its horizontal axis in a round shape to reduce contact sliding resistance with the optical scanning body 1.

Then, the optical scanning body 1 is driven forward and reaches the forward end, and is then driven backward from the forward end and returns to the forward end again. The active double-stroke drive is cut off, but the vehicle continues to run due to inertia. The horizontal shaft 8 (81) of the lever on which the inertially traveling optical scanning body 1 is located in the center of the movement path of the optical scanning body 1 from the side.
It goes on. As a result, lever 4 is moved by the inertial pressing force of optical scanning body l.
rotates around the support shaft 5 in the direction of movement of the scanning body while stretching the spring against the tension spring 7 as shown in the third figure. The optical scanning body 1 is braked and decelerated by the stretching reaction force of this spring, and in this case, the braking force acting on the optical scanning body IK increases nonlinearly due to the reaction force accompanying the stretching of the spring. As a result, the optical scanning body 1 has a short braking length 1 (overrun length) and smoothly decelerates to a stop with low shock due to the gentle non-linear braking curve characteristic.

The optical scanning body 1, which has been stopped by braking, is maintained in a stopped state against the stretching reaction force of the spring 7 by the reversing force of the moving drive mechanism of the optical scanning body 1 or by the separately provided one-time lock mechanism, and is then moved to the next movement. Waiting at the reopening party. Reference numeral 9 denotes a stopper bin for preventing excessive vibration of the lever 4 beyond a predetermined angle in order to prevent abnormal overrunning of the optical scanning body 1.

On the other hand, when the forward movement of the optical scanning body 1 is restarted and the restoring repulsive force in the extended state on the braking device side is reversed, the lever 4 and the horizontal shaft 8
(81) as a forward acceleration auxiliary force through the optical scanning body 1
It acts on The above-mentioned braking of the optical scanning body 1 is caused by the kinetic energy of the optical scanning body 1 being absorbed and stored in the form of the extension of the spring 7, which is the lever biasing means, and the stored energy is When the optical scanning body 1 is accelerated in the forward motion, it is effectively used as an acceleration assisting force, and the forward motion is smoothly started.

The same applies to the brake device AK on the backward movement end side. That is, after the active forward drive is cut off a little before reaching the backward movement end, the optical scanning body 1, which is inertially moving, moves to the horizontal pin 8 of the lever 4.
(81), the optical scanning body 1 is nonlinearly decelerated and then stopped by the reaction force of the extension of the spring 7 accompanying the swinging of the lever 4.

Furthermore, when the optical scanning body 1 starts to move back, the energy absorbed and stored by the extension of the spring 7 during deceleration is effectively utilized as an assisting force for accelerating the scanning body 1 in the backward movement, thereby smoothly starting the backward movement. It is.

One set of nonlinear deceleration curves of the optical scanning body I by each device A@AK at both ends of the forward and backward movements can be arbitrarily set, for example, as follows.

That is, the spring constant of the spring 7, the swing stroke of the lever 4, the distance between the shaft 8 that supports the roller 81 and the lever support shaft 5, the length of the lever 4, etc. are changed. According to these) scanning body 10 conditions 9. For example, mass.

By creating an appropriate nonlinear deceleration curve that matches the speed, etc., it is possible to control the braking of the optical scanning body 10, which is a reciprocating body, as desired.

As detailed above, the motion braking device according to the present invention is capable of decelerating and stopping the moving object with a short braking length and a nonlinear deceleration curve with low shock even when the moving object reaches a stopping point at high speed. In addition, the energy stored during deceleration can be used efficiently during acceleration, and the overall structure is extremely simple and compact, making it extremely excellent and effective as a motion braking device for moving bodies. I hesitate.

Aya 1 The illustrated example is used as a motion control device for a reciprocating optical scanning body l. Of course, it can be widely used as

[Brief explanation of drawings]

The drawings show one embodiment, and FIG. 1 is a perspective view showing a very schematic configuration of a reciprocating optical scanner in a copying machine or the like equipped with the apparatus according to the present invention, and FIG. FIG. 3 is a side view of the motion braking device in a no-load state. Figure 3 is a side view of the moving body in good condition after decelerating and stopping. 1 is a reciprocating body, 1 is the entire motion braking device, 4 is a sliding lever, 7 is a tension spring as the lever biasing means, 80
il) is a horizontal shaft integrated into the lever that receives the moving object. Figure 2 Figure 3

Claims (1)

[Claims] A member that is free to swing around an axis on one end side is arranged at a location where the movable body is to be stopped, and a biasing means is connected in series to the swinging member, so that the swinging member and the biasing unit are connected in series to the swinging member. The rocking member and the biasing means are arranged and constructed so that the means are arranged in a substantially straight line and the linear arrangement line is substantially orthogonal to the moving direction of the moving body, By allowing the moving body in motion to be received by the swinging member, the moving body is initially gently moved by a backward swinging motion against the biasing means centered on the axis of the swinging member. What is claimed is: 1. A braking device for a moving body, which is capable of decelerating a moving body and bringing it to a stop with non-linear braking curve characteristics.