JPS6224328B2 - - Google Patents

Description

Detailed Description of the Invention <Technical Field> The present invention relates to a chain conveying device that reciprocates a conveyed table such as a document table of a copying machine by a chain drive, and in particular, when the chain drive is not used, the conveyed table is manually moved. The present invention relates to a chain conveying device having a function of preventing a conveyed table from locking when the conveyed table is locked.

<Prior Art> Conventionally, as a device for linearly reciprocating the document table of a copying machine, a document table conveying device using a so-called chain delivery system shown in FIG. 1 has been proposed. As shown in the figure, a chain 3 is wound between sprockets 1 and 2, and rollers 4 are attached to the side surface of the link plate of the chain 3. The chain is illustrated from the outer circumference in FIG. 1 and FIG. 3, which will be described later. Then, a plate 5 for connecting with the roller 4 is attached to a suitable place under the document table (not shown), and the roller 4 is inserted into the vertical long hole 6 bored in the plate 5, as shown in FIG. It is inserted. In addition,
A and b in FIG. 1 show the turning points of the rollers at each sprocket.

In the document table transport device described above, the roller 4 is the first
Chain 3 is located above the chain as shown in the figure.
Direction of plate movement (counterclockwise) indicated by arrow L
When driven, the plate 5 moves together with the rollers 4 in the direction of arrow L, and when the rollers 4 move past point a of the sprocket 2 to the lower side of the chain,
Along with this, the plate 5 also moves toward the sprocket 1 side. Then, after passing point b of the sprocket 1, the roller 4 moves to the upper side of the chain again, and the plate 5 also moves to the sprocket 2 side again. By repeating such movement of the rollers 4, the plate 5 moves linearly back and forth between the sprockets 1 and 2, and the document table connected to the plate 5 can be transported back and forth.

As mentioned above, the document table can be transported back and forth by driving the chain 3 in the direction of arrow L during the copying operation of the copying machine. When the plate 5 is moved to the end of the chain, a problem arises in that the rollers 4 become locked at points a and b, as will be described later.

The locking at point b will be explained below with reference to FIGS. 3 and 4. Now, as shown in Figure 1 above, the roller 4
is located above the chain, and the document table is moved to the sprocket 1 side by hand without driving the chain. When the roller 4 moves to point c in front of point b as the plate 5 moves, the fourth
As shown in Figure A, the horizontal force Fh from the plate 5 is divided into a tangential force Ft and a radial force Fr on the sprocket, so the moment due to the tangential force Ft acts on the sprocket. Therefore, the roller 4 can rotate. Therefore, the roller 4 passes through point c and further moves toward point b. Also, when the roller 4 is on the lower side of the chain and the document table is moved by hand in the direction of arrow R, that is, in the opposite direction to the chain drive direction, the plate 5 is moved in the horizontal direction as shown in FIG. 4C. The force Fh'' is divided into a tangential force Ft'' and a radial force Fr'', so the moment due to the tangential force Ft'' acts on the roller 4, which causes b
It is possible to pass through point d before the point.

However, when the roller 4 that has passed through point c or d reaches point b, the component force in the tangential direction of the sprocket 1 with respect to the horizontal force Fh' becomes 0, as shown in FIG. The moment no longer acts. Therefore, at point b, the roller 4 cannot rotate and becomes locked. Such a lock also occurs at point a of sprocket 2.

When the roller 4 is locked at point a or b as described above, the document table cannot be moved from the locked position, so it is necessary to provide a release device to release the lock in the document table transport device. Another disadvantage was that each lock had to be manually released.

<Object of the invention> The object of the invention is to solve the above-mentioned drawbacks by stopping the rollers before the points a and b of the sprocket when the plate is moved when the chain is not being driven. It is an object of the present invention to provide a chain conveyance device that can prevent a conveyed table from locking.

<Structure of the Invention> The present invention provides a mechanism for moving a roller in a direction that does not impede the movement of the roller when the roller is moved toward one sprocket side by driving a chain, and when the roller is moved in a direction opposite to the driving direction of the chain. The present invention is characterized in that a movable stopper is provided near the sprocket to abut against the rollers and suppress movement of the rollers, and a notch is formed at the end of the elongated hole so as to be recessed on the opposite side to the driving direction of the chain.

<Example> Fig. 5 is a configuration diagram of a chain drive system of a document table conveying device in which the present invention is implemented, Fig. 6 is a top view showing the positional relationship between the movable stopper and rollers arranged on the sprocket 1 side, and Fig. 7 The figure is a structural diagram of a movable stopper. In addition, in these figures, the above-mentioned FIGS.
The same parts as those of the document table conveyance device shown in FIG. 3 are given the same numbers.

There are two differences between this embodiment and the document table conveyance device shown in FIG. It is a point. Another difference is that a movable stopper 9 is provided above the chain 3 and near the sprocket 1 side, and a movable stopper 1 is provided below the chain 3 and near the sprocket 2 side.
These points are each set to 0.

The elongated hole 8 is a vertically elongated hole having a width approximately equal to the diameter of the roller and longer than the outer peripheral diameter of the sprocket, and has notches 8a and 8b formed symmetrically at the upper and lower ends. The shape of this long hole 8 will be explained in detail with reference to FIG. . FIG. 8 is a diagram showing a state in which the roller 4 is stopped at point A of the sprocket 2 when the chain is not driven and the document table is moved by hand in the plate moving direction, as will be described later. As shown in the figure, the notch 8a is formed by cutting a width equal to the roller radius r at the upper end side of the elongated hole on the side opposite to the plate moving direction, and the notch 8b is formed at the lower end side of the elongated hole on the side in the plate moving direction. It is formed by cutting out a width corresponding to the roller radius r. The shoulders 11 and 12 at the boundaries between the center of the elongated hole 8 and the notch 8a, and between the center and the notch 8b are cut out in an arcuate shape with a roller radius r so that the outer peripheral surface of the roller 4 follows. ing. The inner surface of the long hole below the shoulder 11 and the inner surface of the long hole above the shoulder 12 are both flat in the vertical direction. The plate 7 with the elongated hole 8 formed therein is attached to the lower side of the document table (not shown), and the roller 4 attached to the side surface of the chain is inserted through the elongated hole 8 to engage the plate 7 and the roller 4. let

As will be described later, the movable stoppers 9 and 10 move so as not to obstruct the movement of the rollers 4 when the chain is being driven, and when the chain is not being driven, the document table can be moved by hand in the direction of arrows L or R. At this time, a lock is installed in front of the sprocket to prevent the rollers 4 moving from the top of the chain from reaching point b of sprocket 1, or from the bottom of the chain reaching point a of sprocket 2. This is a stopper for prevention. and,
The movable stopper 9 is connected to the rotating shaft 9 as shown in FIG.
It is composed of a contact rod 9a and a stop rod 9c that are attached in directions perpendicular to each other with respect to b.
If a force is applied in the direction of the arrow S while hanging vertically, it will rotate in that direction, but if a force is applied in the opposite direction to the arrow S, the stop bar 9c will hit the mounting member 9d and it will not move in that direction. It has a one-way rotation structure that cannot be rotated. The movable stopper 9 having such a rotating structure is arranged in front of the sprocket 1, and the contact rod 9a faces the movement path of the rollers 4 on the upper side of the chain, so that the rollers 4 move from the upper side of the chain in the opposite direction to the chain drive direction. When the rollers 4 move in the direction and come into contact with the contact rod 9a, the rollers 4 try to rotate the contact rod 9a in the direction opposite to the arrow S, but as described above, the contact rod 9a does not move in that direction. Since the rollers 4 cannot be rotated, movement of the rollers 4 can be inhibited. Also, like the movable stopper 9, the movable stopper 10 has a one-way rotation structure in which the contact rod 10a can rotate only in the direction of the arrow T. This movable stopper 10
is arranged in front of the sprocket 2, and the contact rod 10a faces the roller movement path on the lower side of the chain, and when the roller 4 is on the lower side of the chain and moves in the opposite direction to the chain driving direction, 4 contacts the contact rod 10a and applies a force in the direction opposite to the arrow T, but since the contact rod 10a cannot rotate in the direction opposite to the arrow T, movement of the rollers can be suppressed. Note that when the chain is driven, the rollers 4 move counterclockwise in FIG. 5, so the contact rods 9a, 10
Even if the rollers 4 hit the point a, each contact rod rotates in the directions of arrows S and T and does not interfere with the movement of the relief rollers.

The operation during chain drive in the document table conveying device having the above configuration will be described.

As shown in FIG. 5, the roller 4 passes through the upper part of the elongated hole 8 while being above the chain 3.
In this state, when the chain 3 is driven in the plate moving direction shown by the arrow L, the plate 7 is moved together with the rollers 4.
moves in the direction of arrow L. When the plate 7 approaches the sprocket 2, the roller 4 moves downward along the flat inner surface of the elongated hole on the opposite side of the notch 8a and passes through point a of the sprocket 2. After the roller 4 passes point a, the roller 4 further moves to the lower side of the chain 3 and toward the sprocket 1 along the flat surface of the elongated hole 8 on the opposite side from the notch 8b. As the rollers 4 pass through point a, the plate 7 returns to the sprocket 1 side together with the rollers 4.
Then, as the roller 4 passes through the sprocket 2 and moves toward the sprocket 1 side, the movable stopper 1
However, as mentioned above, the contact rod 10a rotates in the direction of the arrow T, that is, in a direction that does not impede the movement of the rollers, so the rollers 4 move to the sprocket 1 side without any hindrance. Can be moved. Furthermore, when the plate 7 approaches the sprocket 1, the roller 4 moves upward along the flat surface of the elongated hole on the opposite side to the notch 8b and passes through point b of the sprocket 1. b
After passing the point, the roller 4 moves upward along the flat surface of the inner surface of the elongated hole opposite to the notch 8a, and passes through the sprocket 2. After passing the sprocket 2, the roller 4 moves to the upper side of the chain 3 and moves to the sprocket 2 side again. As the roller 4 passes point b, the plate 7 moves toward the sprocket 2 again. Then, like when the sprocket 2 is returned, the rollers 4 come into contact with the contact rod 9a, but as mentioned above, the contact rod 9a rotates in the direction of arrow S, that is, in a direction that does not impede the movement of the rollers. So,
The roller 4 can be moved to the sprocket 2 side without any problem. In this way, similarly to the document table conveying device shown in FIG. 1, by circulating the rollers 4 between the sprockets 1 and 2 by driving the chain 3, the document table connected to the plate 7 can be transported back and forth. can. Note that in this document table transport device, the elongated hole 8
Notches 8a and 8b are provided in the platen, and when the chain is not being driven, the document table is placed on sprocket 1, as described later.
When moving to the 2 side, the roller 4 is stopped at point A before point a or point B before point b. However, when driving the chain, the roller 4 passes through sprockets 1 and 2 as described above. Notch 8 when
Since the roller 4 moves along the flat surface of the inner surface of the elongated hole on the opposite side from a and 8b, it is not affected by the provision of the notches 8a and 8b. Therefore, the rollers 4 can smoothly pass through the sprockets 1 and 2 without causing rattling or shaking the document table.

Next, the function of the movable stoppers 9 and 10 to prevent the rollers from locking will be explained.

In the document table transport device described above, when the drive of the chain 3 is stopped with the rollers 4 above the chain 3, if the document table is manually moved in the direction of the arrow R opposite to the chain drive direction. , Koro 4
contacts the contact rod 9a. At this time, the rollers 4 apply force to the contact rod 9a in the direction opposite to the arrow S, so the contact rod 9a does not rotate, thereby preventing the rollers 4 from moving toward the sprocket 1 from the movable stopper 9. Can not. Therefore, in this case, roller 4 is b
Since the roller 4 cannot reach the point b, it is possible to prevent the roller 4 from locking at the point b. Furthermore, when the drive of the chain 3 is stopped with the roller 4 located below the chain 3, if the document table is moved by hand in the direction opposite to the chain drive direction, the roller 4 will be moved to the contact rod 10a. However, the contact rod 10a does not rotate in that direction, so
Similarly to the above case, the roller 4 can be stopped while in contact with the contact rod 10a. Therefore, in this case as well, the rollers 4 cannot reach the point a, and it is possible to prevent the rollers 4 from locking at the point a. When the document table is moved in the opposite direction to the chain drive direction without the chain being driven as described above, the movable stopper 9 or 10 prevents the rollers 4 from reaching points a and b to prevent them from being locked. can do.

Next, referring to FIG. 8, a description will be given of the lock prevention operation when the document table is manually moved in the same direction as the chain drive direction when the chain is not driven.

When the drive of the chain 3 is stopped with the roller 4 above the chain 3, if the document table is moved by hand in the direction of plate movement indicated by the arrow L, the roller 4 will stop at point A, which is before point a. do. As shown in FIG. 8, point A corresponds to the center of the notch for forming the shoulder portion 11 into an arc shape, and is on a line forming an angle θ with the line Oa connecting the center O of the sprocket 2 and point a. A
When the roller 4 that has reached the point is further moved toward the point a, the roller 4 tries to rotate by the component force F in the tangential direction of the outer circumference of the sprocket 2, but the center of the roller 4 is Since the roller 4 is deviated from the center line in the longitudinal direction of the elongated hole by the roller radius r, the roller 4 comes into contact with the shoulder 11 and cannot rotate, and stops at point A. As described above, when the chain is driven, the roller 4 moves along the flat surface of the inner surface of the long hole on the opposite side to the notch 8a and passes through the sprocket 2, so the notch 8a does not interfere with its passage. Furthermore, when the plate 7 is moved in the same direction as the chain drive direction with the roller 4 located below the chain 3, B is located on a line that forms an angle θ clockwise from the line connecting the center of the sprocket 1 and point b. At this point, the roller 4 comes into contact with the shoulder 12 and cannot rotate, as in the case of the above-mentioned point A, and therefore stops.
In this case, as mentioned above, when driving the chain,
Since the roller 4 moves upward along the flat surface of the inner surface of the elongated hole opposite to the notch 8b, it can smoothly pass through the sprocket 1 without being hindered by the notch 8b. As described above, the roller 4 is stopped at point A or B by the action of the shoulder 11 of the notch 8a or the shoulder 12 of the notch 8b.
It is possible to prevent the roller from locking at the point. Note that when the roller 4 is stopped at the stop positions of points A and B and the movable stoppers 9 and 10, the rollers can be moved by moving the document table in the opposite direction to the direction in which it was moved to each stop position. 4 can be removed from the stopped position.

As described above, when moving the document table by hand, the roller 4 can be restricted to move only between point A and the movable stopper 9 or between point B and the movable stopper 10. Therefore, when the document table is moved by hand, roller 4 moves only within the above movement range and does not reach points a and b.
It is possible to completely prevent locking at any point. As a result, there is no need to provide a lock release device, and costs can be reduced, and the effort of releasing the lock can be saved. In addition, the movable stopper 9,
10 can be provided at any position by arranging each contact rod on the moving path of the roller, and the 8th
As shown in the figure, the distance α from the longitudinal center line of the long hole 8a to the center of the roller 4 (in the above example, α≒
r) and the notch length β from line Oa to the shoulder, the angle θ that defines the stopping position of the roller can be changed, and the range of movement of the roller when the chain is not driven can be easily and It has the advantage of being able to be set arbitrarily.

<Effects of the Invention> As explained above, according to the present invention, when the chain drive is stopped and the conveyed table is manually moved in the same direction as the chain drive direction, the rollers are not engaged before the turning point of the sprocket. Since the roller stops when it comes into contact with the notch formed in the elongated hole of the joining piece, the roller does not reach the turning point and can be prevented from locking at the turning point. Furthermore, even when the conveyed table is moved in the opposite direction to the chain drive direction, the rollers hit the movable stopper and stop before the sprocket. Locking can be prevented. Therefore, it is possible to reduce costs by eliminating the need for a lock release device, and to save time and effort for releasing the lock. Furthermore, when the chain is driven, the movable stopper escapes in a direction that does not impede the movement of the rollers, and around the sprocket, the rollers move along the flat surface of the long hole without getting caught in the notch, preventing rattling. It is possible to pass through the sprocket smoothly without raising the rollers or shaking the conveyed table, and thereby the rollers can be provided with a lock prevention function without interfering with the movement of the rollers.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a chain drive system of a conventional document table conveyance device, FIG. 2 is a top view showing the state of engagement between rollers and plates in the document table conveyance device of FIG. 1, and FIG. 4A to 4C are vector diagrams of the forces acting on the rollers at the folding point of the sprocket of the document table conveyor shown in FIG. 1 and its surroundings; FIG. 5 is a block diagram of the chain drive system of the document table conveyance device according to the present invention, FIG. 6 is a top view showing the positional relationship between the rollers and the movable stopper in the document table conveyance device of FIG. 5, and FIG. 8 is a structural diagram of the same movable stopper, and FIG. 8 is a diagram of the vicinity of the sprocket for explaining the stopping operation of the rollers by the action of the notch formed in the plate used in the document table conveying device of FIG. 5. 1, 2... Sprocket, 3... Chain, 4... Roller, 7... Plate (as an engaging piece), 8... Elongated hole (drilled in plate 7), 8a, 8b... (Upper and lower ends of elongated hole 8) 9, 10...Movable stopper.

Claims (1)

[Claims] 1 Attach a roller to a chain wound between sprockets, attach an engaging piece with a long hole to the conveyance platform, fit the roller into the long hole of the engaging piece, and drive the chain to move the roller. In the apparatus for reciprocating the conveyed table by moving the rollers, when the rollers are moved to one sprocket side by driving the chain, the rollers move in a direction that does not impede movement of the rollers, and are opposite to the driving direction of the chain. A movable stopper is provided near the sprocket to abut against the roller and prevent the roller from moving when the roller is moved to the side, and at the end of the elongated hole,
A chain conveyance device characterized in that a notch is formed to be recessed on a side opposite to the driving direction of the chain.