JPS62285827A - Elevating device for sheet material - Google Patents

Abstract

PURPOSE:To prevent breakage of mechanical parts other than a detecting means for an appropriate stopping position of a plate, which malfunctions, by providing a control means for stopping the movement of the plate when no signal is obtained from the detecting means. CONSTITUTION:When an elevating signal is issued to start the operation of a timer means T, if no stopping signal is issued from a photo interrupter 23 within a time (t) set on the timer means T, it is determined that the photo interrupter 23 is abnormal, and therefore, a motor 6 is stopped at once by a stopping signal delivered when the time (t) elapses. Further, since a stopper 25 is provided abutting against an intermediate plate 2, at a position slightly above a suitable stopping position, the intermediate plate 2 is subjected to a load by the stopper 25. Upon receiving of the load by the stopper 25, a torque transmission force by the fastening force of a coil spring 11 is overcome so that the coil spring 11 races around the boss of a sprocket 9b, and therefore, the travel force of a chain 12 exceeding a predetermined value is isolated. Further, after a time T elapses, an elevation signal for the motor is cut off.

Description

[Detailed description of the invention] 3. Detailed description of the invention (a) Industrial application field The present invention relates to a type of device for lifting and lowering a funnel, and more specifically relates to drive control of a lifting mechanism for a lont material in an image forming apparatus such as a copying machine or a recording machine.

(b) Conventional technology Conventionally, C!・The material lifting device is as shown in Figure 4.
It consists of an intermediate plate 2 on which sheet materials 1 such as paper are loaded, and a drive source 3 for raising and lowering the intermediate plate 2 and sheet materials 1 via a chain or the like. In the feeding device, the sheet material 1 placed on the middle WZ 2 is raised to the position of the feeding roller 5 by the driving force of the driving source 3 and fed.

The feeding roller 5 is vertically swingable and biased downward in the figure, and the driving source 3 is activated when moving the sheet material to the above-mentioned feeding position. For control purposes, a means for detecting the height of the uppermost seat 1-H or the height of the feeding roller 5 is provided, and the raising by the drive source 3 is controlled by the detection output. In other words, Kakeru!
The sheet material 1 loaded on the middle plate 2 is ordered to activate the a source 3.
is raised together with the intermediate plate 2 by the drive source 3, and the feeding roller 5
However, since the above-mentioned detection means is provided, the driving of the drive source 3 is stopped by the signal from the detection means, and the sheet material 1 stops rising at the appropriate position, and the sheet material 1 stops being fed. It will be in the sending state. Next, in a situation like this,
The feeding roller 5 rotates, thereby feeding the sheet material 1 from the topmost sheet, and after feeding a plurality of sheets, the topmost position of the sheet material 1 is lower than the appropriate feeding position. If so, this is detected by the detection means, and the sheet material 1 is raised by the drive source 3 so that it is in the proper position again.

In addition, when the sheet material 1 is running low and it is desired to replenish the sheet material 1, by lowering the intermediate plate 2 downward by the drive source 3, a sufficient amount of the gluing material 1 can be replenished. becomes possible.

In this way, the device having the above configuration can drive the middle plate 2 by the drive source 3.
For example, in the case of a deck-type (lift-type) automatic paper feeder in a copying machine,
A large amount of paper (about 2,000 sheets, for example) can be set on the middle plate 2 at one time, and as mentioned above, the middle plate 2 automatically rises as paper is fed, so the operator frequently There is no need to replenish the paper, which is particularly convenient for frequently used paper sizes.

→ Problems to be Solved by the Invention By the way, as the above-mentioned proper position detection means, electrical sensors such as microswitches and photo-insulators are often used. If a malfunction occurs, the proper position cannot be detected, and therefore, while there is the above-mentioned advantage, when such an abnormality occurs in the detection means, the rising signal remains in the drive source 3. If the rising signal remains in the drive source 3 due to a failure, the drive by the drive gJ source 3 will continue, resulting in damage to the detection means, drive source 3, drive mechanism, feeding section, etc. Put it away.

(5) Means for Solving the Problems The present invention aims to solve the above-mentioned problems. Prevention 8JI#fI19! prevents damage to other mechanical parts when an abnormality occurs in the detection means using a simple mechanism. A mechanism for raising and lowering a slope for placing sheet materials of a material storage body relative to a feeding means, a driving means for the same, and a detection means for detecting an appropriate stopping position of the plate; It is characterized by comprising a field control means that stops the movement of the board when a signal from the board proper stop position detection means cannot be obtained after a certain period of time after the board starts moving. be.

(E) Operation When moving the sheet material loading plate and the sheet materials loaded thereon up or down based on the above means, if the detection means is normal, a signal from the detection means can be obtained at the appropriate stop position, As a result, it is stopped in the a-orientation position.On the other hand, in the event of an abnormality in the proper stop position detection means, even if no signal is obtained from the detection means, the belt material i device plate starts moving up and down, and a certain period of time elapses. The control means then causes the plate to stop moving without causing damage to the associated mechanism.

←→ Examples Examples of the present invention will be described below with reference to the drawings.

First, an embodiment in which a motor dedicated to raising and lowering sheet material is used as a drive source and applied to a lifting device will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, a gear 7 is attached to the output shaft of the mokuro as a drive source, and this gear 7 meshes with the input gear 9a of the torque limiter 9. The output sprocket 9b is held on the shaft 10 and is at zero.

The torque limiter 9 has a structure as shown in FIG. 2, and includes a boss portion of an input gear 9a and an output sprocket 9b.
A coil spring 11 wound in the same direction as the arrow B in FIG. The predetermined tightening force is set to a force that slightly exceeds the force that would increase the weight of the middle plate 2 and the sheet material 1 shown in FIG. ing.

Further, as shown in FIG. 1, a chain 12 is stretched between the sprocket 9b and the sprocket 13 of the torque limiter 9, and is integrated with the intermediate plate 2 on which the sheet material 1 is placed halfway.

Furthermore, above the sheet material 1, a feeding roller 5 made of a rubber material with a high coefficient of friction is held on a shaft 15. The arms 16a and 16b rotatably hold the shaft 15, and the other end thereof is held swingably on the shaft 17.

A spring 19 is tensioned at the end of the arm 16a, and applies a load to the feed roller 5 in a direction to press it against the sheet. Further, a gear 20 is integrally fixed to the shaft 17 and meshes with an idler gear 21 on the arm 16a. Furthermore, a gear 22 is integrally fixed to the shaft 15.

Furthermore, a first ink club 23 is provided near the end of the arm 16a. As will be described later, the rotation of the mokuro is stopped when the end of the arm 16a passes through the photo ink clubter 23.

Further, the motor 6 is connected to a control unit Cζζ,
The control unit C controls a slight movement ikl with respect to the maximum movement stroke of the intermediate plate 2, that is, the distance gIt from the lowest position of the intermediate plate 2 to the proper stop position when one sheet material 1 is loaded on the intermediate plate 2. A timer means T is provided in the control section to calculate the time t obtained by calculating the distance e+4□, which is the sum of , from the moving speed of the chain 13.

Furthermore, a stopper 25 is provided at a position slightly elevated from the proper stop position so as to come into contact with the intermediate plate 2.

Since the present embodiment has the above-described configuration, when the operator etc. issues a signal to start feeding, the mokro moves in the direction of arrow A.
The input gear 9a of the torque limiter 9 starts rotating in the direction
Rotate it in the direction of arrow B.

At this point, the torque limiter 9 is applied (as mentioned above, the weight of the intermediate plate 2 and the sheets 1 to 1 placed on it to the maximum 81 may be increased. Since the coil spring 11 is oriented in the same winding direction, when the input gear 9a rotates as described above, the input gear 9a
The rotation of is transmitted to the output sprocket 9b via the coil spring 11, and moves the chain 12 in the direction of arrow C.

If the driving force is transmitted to the chain 12 in this way,
Since the chain 12 is fixed to the middle plate 2, as the chain 12 rotates, the sheet material 1 on the middle plate 2 is moved to the direction indicated by the arrow C.
Raise it in the direction. Then, the sheet material 1 that has risen comes into contact with the feeding roller 5, and is pushed up against the spring 19 while swinging about the shaft 17.

Here, when the arm 16a rotates in response to the above-mentioned push-up and the end of the arm 16a passes through the 7-stroke incruptor 23 provided in its vicinity, a stop signal is issued under normal conditions. , the rotation of the mokuro is stopped,
The position is maintained by a brake (not shown) of the motor 6 itself.

Then, at this position, the feeding roller 5 starts rotating, and the sheet material 1 is fed starting from the uppermost one.

In this way, by the rotation of the feed roller 5, sheets 1 to 1 are
However, if the upper surface position of the sheet material 1 becomes lower, the sheet material 1 is raised again by that amount. That is, when the end of the arm 16a that swings and follows the upper surface of the sheet 1 to the material 1 by the spring 19 is out of the detection position of the foot I/interrupter 23, a rising signal is issued to the motor 6 again, and the above-mentioned rising operation is performed. will be repeated.

Next, an explanation will be given of the operation in the case of an abnormality in which the stop signal is not generated due to a failure or malfunction of the photo ink converter 23.

The control section C of the motor 6 has a timer means T for the time E as described above. This time t is e+! which is the maximum movement stroke p of the middle plate 2 plus a slight movement number 11! ,
Since this is set to the time calculated from the distance and the chain speed in step 2, if the first interrupter 23 is operating normally, the photo ink interrupter is activated at a point before the time t elapses. A stop signal was issued by 23,
Therefore, normally no stop signal is issued due to this time t.

However, when the photo ink printer 23 is abnormal, this photo
, since a stop signal cannot be obtained due to the ink bar 23,
In this case, the timer means T automatically issues a stop signal when the above-mentioned time has elapsed.

That is, when the rising signal is issued, the timer means T starts operating, but if by any chance the stop signal is not issued by the photointerrupter 23 within this time, it is assumed that there is an abnormality in the photointerrupter 23 and the above-mentioned operation is performed. The motor 6 immediately stops due to the stop signal at time t. In addition, since a stopper 25 that comes into contact with the middle plate 2 is provided at a position slightly elevated from the proper stopping position, the middle plate 2 receives a load from the studs 1 to 25 immediately after passing the proper stopping position. In order to receive the load, the coil spring 1 idles on the boss of the sprocket 9b in the torque limiter 9 described above to exceed the torque transmission force due to the tightening of the coil spring 11, and the moving force of the chain 12 above the window is cut off. dripping Further, as described above, after time T, the rising signal to the motor 6 is cut off.

Therefore, even if the motor 6 runs out of control due to an abnormality in the position detection section, a certain abnormal load will not be applied to each mechanical section.
Furthermore, since the drive of the motor 6 is automatically stopped in a short time, there is no possibility of damage to the mechanism.

Next, an embodiment will be described based on FIG. 3, in which the present invention is applied to an elevator using a motor that also serves as a drive source for other mechanical parts.

While the above embodiment uses a motor dedicated to lifting and lowering the sheet material as a drive source, in this embodiment, the motor 26 is not a motor dedicated to lifting and lowering the sheet (it also drives other drive units. Transmission of the driving force from the motor 26 to the chain 12 for raising and lowering the sheet material is performed by an electromagnetic clutch 27. When this electromagnetic clutch 27 is energized, the amper, which was idling on the shaft 29, is attracted to the loaf. On this axis 29, the subroket ν1
・30 is installed. A chain 12 for raising and lowering the sheet material is mounted on such a sprocket 30.

In addition, regarding the transmission of the driving force by the electromagnetic clutch 27, the dynamic friction is slightly higher than the torque required to raise the middle plate for placing the sheet material and the 0-tone material when loaded with WI4!・It is set to transmit the light.

Note that the other configurations are the same as in the case of embodiment B.

Since this embodiment has a hypothetical configuration, the driving force for lifting the sheet material is obtained by rotation of the sprocket 30 via the electromagnetic clutch 27.

That is, when the sheet material 1 is raised, the electromagnetic clutch 27 is energized, and by energizing the electromagnetic clutch 27, the armature that was idling on the shaft 29 is attracted to the loaf and becomes integrated with the shaft 29. A sprocket 30 fixed on the shaft 29 is rotated. This sprocket 30
The rotation of the sheet material lifting chain 12 is driven, and the sheet material on the intermediate plate is raised relative to the feeding means. The subsequent operations are similar to those in the previous embodiment. At this time, in this embodiment, the electromagnetic clutch 27 is set to transmit a dynamic*a torque that is slightly higher than the torque that raises the middle plate and the sheet materials loaded thereon, so the suitable stopping position of the middle plate is determined. In the event of an abnormality such as failure or malfunction of the detection means, a torque greater than the transmission torque will cause slippage between the armature and the rotor, and therefore the same effect as in the case of the torque leak in the previous embodiment can be obtained.

In the above-described embodiments, the driving means is constructed of a torque hydraulic or clutch means that transmits only a relatively low I/Lux to the driving source. It is also possible to have

In addition, in each of the embodiments, although the control of the upward movement of the material was described, the same applies to the lower limit stop position of the middle plate, so there is an abnormality in the downward drive stop signal. It can also be applied in such cases.

In this case, it is sufficient to have a lower limit detection sensor and a stopper and stop the motor at the maximum stroke time + α time.

(g) As described in detail, according to the present invention, there is provided an 81 structure for raising and lowering a plate for placing sheet materials in a sheet material storage body relative to a feeding means, a driving means for the same, and a detection means for detecting an appropriate stop position, and a certain period of time after the plate starts moving;
The control means is configured to stop the movement of the plate 2 when a signal from the proper stop position detection means for the plate 2 cannot be obtained, so in the unlikely event that the detection means breaks down or malfunctions, it will be detected. Even if there is an abnormality in the lifting drive stop signal such as a signal not being obtained by the means, the drive can be automatically stopped by another stop signal without damaging the related mechanism.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a structural diagram of the torque IJE vine, Fig. 3 is a perspective view showing another embodiment of the invention, and Fig. 4 is a sheet material. FIG. 2 is a side view showing a conventional technology of a lifting device for a storage body. 1. Sheet material, 2. Middle plate, 5. Feeding roller, 6.26. Motor, 9-1, Lucrimic, 12. Chain, 23..
・Photo ink rubber , , 25 ・Stopper , 27
・Electromagnetic clutch, T・Control means (timer).

Claims (2)

[Claims] (1) A mechanism for raising and lowering a plate for placing sheet materials in a sheet material storage body relative to a feeding means, a driving means for the same, a detection means for detecting an appropriate stopping position of the plate, and a mechanism for causing the plate to start moving. and control means for stopping the movement of the plate if a signal from the proper stop position detection means for the plate cannot be obtained after a certain period of time. (2) The driving means is characterized in that the driving source has a relatively low driving torque or is constituted by a clutch or torque limiter means that transmits a relatively low torque to the driving source. A lifting device for a sheet material storage body according to scope 1.