JPS587980B2 - Automatic separation device in copying machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for separating originals and photosensitive paper in a copying machine.

In copying machines, especially diazo-type copying machines, in which the original and photosensitive paper are overlapped and printed, the original and the photosensitive paper are separated after passing through the exposure section in close contact, and only the photosensitive paper is transferred to the developing section. must be sent to.

There are various types of devices that automatically do this, but some of them feed the document and the photosensitive paper at different speeds to create a misalignment in the direction of travel. There is a type of paper that performs separation by finally guiding the leading edge of the paper in a certain direction using some kind of guide.

There are many devices that use a rotating claw-like member as a guide, as well as many inventions and ideas related thereto, but the present invention also relates to improvements in this type of separation device, and in particular, new and novel devices that have not been seen to date. This provides a separation mechanism with unique characteristics.

Conventional automatic separation devices of this type can be broadly classified into two types.

One is to have a rotatable claw in the path of the paper, and the paper (usually photosensitive paper) pushing forward or in the middle of the paper pushes this claw on its own to change its direction of travel. It is something.

This kind of self-propelled rotary claw was developed in Japanese Patent Application Publication No. 4
7-16138, Utility Model Publication No. 48-10440, etc., the claw-like member is driven by an external force to change direction without relying on the propulsion force of the paper itself.
-4145, JP-A-51-32640, etc. belong to this type of drive.

In the case of the self-propulsion type, the rotating claw must be rotated by the propulsive force of the paper, so that extra propulsive force of the paper is required.In other words, the force that inhibits the advance of the preceding paper is transferred from the rotating claw to the paper. It will be given to

It is clear that this has a negative effect on the differential operation in which different feed speeds are applied to the original and the photosensitive paper to cause misalignment.

On the other hand, since the rotating claw is rotatably arranged in the paper advancing path, the rotating claw is rotated not only by the leading edge of the paper, but also by being rubbed against the back surface of the paper as it continues to pass through. This unnecessary rotation causes various practical problems.

Furthermore, it is difficult to reliably stop the rotary claw at a fixed position where it should wait after one rotation, since this conflicts with operating the rotary claw with as little force as possible.

On the other hand, the operation of the separation device using the above-mentioned drive-type claw member is as follows.

The claw-like member usually stops at a certain standby position, and when the paper to be separated approaches or reaches the claw on the claw-like member, this is detected and the rotational movement of the claw-like member is activated. Start, complete the separation operation, and stop again at the standby position.

Conventionally, in many devices of this type, the following method is used for stopping the claw-like member.

That is, before and after the above-mentioned standby position, a certain amount of torque is always applied to the claw-like member in the normal direction of rotation, and on the other hand, the swinging member is cleverly mounted on a shaft, and one end of it is connected to the paper traveling path. The other end is engaged with a part of a notch or the like on the claw-like member.

Due to this engagement, the claw-like member stops at a certain standby position, and when one end of the swinging member is pushed by the advance of the paper, the other end and the claw-like member are disengaged, and the claw-like member The rotation of is started by the above torque.

Although this method of locking a claw-like member using a swinging member works to a certain extent, it has the following drawbacks.

The original purpose of the swinging member is to detect the proximity of paper, so of course it is better to operate with as little force as possible when pushed by the leading edge of the paper, and if it is heavy, it will slow the progress of the paper. As mentioned in the disadvantages of self-propelled type, it hinders self-promotion.

However, the other end of the swinging member engages with a part of the claw-like member to which a certain torque is applied, and the swinging member is held down by this engagement, so the above-mentioned movement of the swinging member is prevented by a light force. In order to do this, the torque must also be reduced.

When the torque decreases, the rotation of the pawl member tends to become uncertain, and the period from when the pawl member stopped at the standby position is released and starts until it reaches a predetermined speed is strictly defined. That's how long it will take.

This prolongation of the start-up time may become a functional problem when the speed of the copying machine becomes extremely high.

In other words, when the speed is high, the distance traveled by the paper is large even in a short period of time, and the paper advances before the claw-like member reaches a predetermined speed, causing the paper to overlap the claw on the claw-like member that should receive the leading edge of the paper. There is a tendency that the relative positional relationship with the tip cannot be maintained, or that the alignment of the claws of a plurality of claw-like members actually used at intervals along the same axis becomes unstable.

An object of the present invention is to eliminate the above-mentioned drawbacks of conventional devices and to obtain a more reliable separation device.

The first object of the present invention is to enable the claw that rotates to change the direction of the leading paper, which is the original purpose, to be moved by sufficient driving force in the entire rotation range except the standby position. be.

A second object of the invention is to enable the pawl to be started from its standby position by a light force on the leading edge of the leading paper, without compromising the first object.

A third object of the present invention is to prevent the occurrence of problems such as failure to maintain the relative positional relationship between the leading edge of the preceding paper and the above-mentioned claws or poor alignment of the plurality of claws during the operation of the claws. The present invention is to allow the pawl to overrun at a speed faster than a predetermined speed when an external force is applied to the pawl in the normal rotational direction, thereby correcting the above-mentioned disadvantage. has the following structure to achieve this purpose.

That is, a rotating cylindrical body, a spring wound around the spring, and a control member having one end of the spring fixed and rotatable coaxially with the rotating cylindrical body, and when the control member is stopped, the cylinder The spring on the body is loosened so that the rotation of the cylindrical body is not transmitted to the spring, and on the other hand, a member is placed that swings at the leading edge of the advancing paper, and when this swings, the stop of the control member is released and the cylinder rotates. A spring is wrapped around the body and the spring is driven.

By connecting the claw-like member directly or indirectly to this spring, the claw-like member obtains sufficient torque over the entire rotation range except when stopped, and the swinging member does not directly lock the claw-like member. Since the pawl member is stopped by the locking of the control member without any movement, the force required for the rocking member to release the lock is significantly reduced.

Although the present invention is a new invention for performing reliable separation as described above, there are also other inventions and ideas for partially similar purposes.

Japanese Patent Publication No. 52-13091 discloses a method in which a ratchet pawl pivotally mounted on the pawl member is released and engaged with the ratchet in order to apply sufficient torque during rotation of the pawl member.

However, torque is applied to the claw-like member due to frictional engagement in the standby position, and this is applied to the engaging portion of the swinging member, and furthermore, the driving force obtained by the frictional engagement is not necessarily exact and uniform. Considering the above, there is no improvement in the sense that the swinging member is actuated by a light advancing force of the paper.

In addition, in the invention of Utility Model Registration Application No. 52-178161, which was filed by the inventor of the present invention for the same purpose, the purpose was achieved in the same way as the present invention5.
, the structure is rather complicated, and there is a risk that the pawl-like member at the standby position may be rotated by external force and stop at a position other than the standby position, and furthermore, a ratchet is used as in the above-mentioned Japanese Patent Publication No. 13.091/1982. Therefore, the position of the pawl-like member during rotation may be discontinuous due to the limit of the distance between the teeth of the ratchet.

The structure and operation of the present invention will be explained below with reference to FIG.

FIG. 1 shows a sectional side view of the structure of a drive system forming a part of the present invention, and the principle of its operation will be explained.

1 and 1' are driving cylinders, 2 and 2' are springs 3 and 3' are driven bodies, and 4 and 4' are control members (annular in the figure).

One end of the spring 2, 2' on the drive cylinder side is fixed to the control member 4, 4'.

In FIG. 1A, the entire spring 2 is wound on the drive cylinder 1 in a left-handed thread direction, and the other end of the spring 2 is fixed to the driven body 3.

In Fig. 1B, a part of the spring 2' is attached to the drive cylinder 1.
' is wound in the left-hand thread direction, and the remaining part is wound around the driven body 3.
’ is wrapped around.

In this case, the other end of the spring 2' does not need to be fixed to the driven body.

For example, when the drive cylinders 1 and 1' now fixed to the drive shaft rotate in the direction of the arrow, the springs 2 and 2'
Since the spring is wound counter-clockwise toward the driven bodies 3, 3' when viewed from ', the spring is tightened and rotates in unison with the driving cylinders 1, 1'.

In Fig. 1A, the rotation of this spring 2 is 5.
Although the spring 2' in FIG. 1B is directly connected to the driven body 3' as shown in FIG. The driven body 3' is rotated as a unit by winding the driven body 3' around the driven body 3'.

When the rotation of the drive cylinders 1, 1' continues, the control member 4
, 4' are stopped by an external force, one end of the springs 2, 2' fixed thereto stops, and the rotation of the drive cylinders 1, 1' loosens the springs 2, 2'. The driven bodies 3, 3' stop.

Also, if another external force is applied to the driven bodies 3, 3' in the direction of rotation during rotation, the springs 2, 2' will loosen, so the driven bodies 3, 3' will move at a faster speed than the driving cylinders 1, 1'. This will cause an overrun.

By stopping the driven body using a control member via a spring in this way, it is possible to stop the driven body with an extremely light force, and it is also possible to drive the driven body with a large torque. The drive body can be overrun by external force.

FIG. 2 shows an embodiment of an automatic separation device essentially using the principle of FIG. 1A, with FIG. 2A showing a side view of the device and FIG. A cross-sectional view taken from the E exit line in the direction of the arrow is shown.

5 is a rotating cylindrical body fixed to the drive shaft 11, 6 is a spring that is entirely wound around the rotating cylindrical body 5, and 7 is a first
A claw-like member corresponding to the driven body in the figure has a claw 7a thereon, and 8 is a control member.

The claw-like member 7 and the control member 8 are each coaxial with the cylindrical body 5, but are independently rotatably supported, and are fixed to each end of the spring 6.

Reference numeral 9 is a swinging member which is mounted on a shaft 10 fixed to a machine frame (not shown), with one end 9a thereof looking into the paper path and the other end 9b engaging with a notch 8a of the control member 8. be.

While the control member 8 is stopped due to engagement with the swinging member 9, the spring 6 is relaxed, so the torque applied to the control member 8 is extremely small. 8, so it stops completely in the normal position.

When one end 9a of the swinging member is pushed by the advance of the paper, the other end 9b of the swinging member comes off from the notch 8a of the control member 8 with an extremely light force, and the control member 8 rotates due to the rotation of the cylindrical body 5. The spring 6 is tightened and a large driving force is applied to the claw-like member 7.

The leading edge of the paper engaged with the pawl 7a is thus advanced in a constant relationship with the rotation of the pawl 7 and guided in a predetermined direction.

Since this claw-like member 7 corresponds to the driven member 3 in FIG. 1A, it is clear that when the forward speed of the paper is high, the resulting external force can cause overrun in the forward rotation direction.

In this Fig. 2, the driven body 3 in Fig. 1A is used as a claw-like member, but the same effect can be obtained even if the driven body and the claw-like member are provided separately and mechanically connected. Of course you can get it.

FIG. 3 shows the automatic separating device in FIG. 2, differential rollers that shift and supply photosensitive paper and original documents to the automatic separation device, guide rollers that guide the photosensitive paper or original documents to the developing process or to the outside, and a discharge port. FIG. 3A shows the instantaneous state of the automatic separating device when it is started, and FIG. 3B shows the operating state of separating the photosensitive paper and the document when the automatic separating device is installed.

According to these figures, after the original (two-dot chain line) and photosensitive paper (one-dot chain line) are overlapped and subjected to printing processing, they are guided to the guide plate 12, and a pair of differentials that give a difference in the feeding speed of the two papers are introduced. The two sheets of paper are passed through moving rollers 13 and 14 (normally, the peripheral speed of roller 14 is about twice that of roller 13), causing a shift in the leading edges of both sheets.

Next, both papers advance along the guide plate 15 and the leading paper (photosensitive paper)
Push up one end 9a of the swinging member 9 (which is adjusted so that it swings slightly in the forward or counterclockwise direction of the hour hand as seen in the figure, but normally it has a tendency to swing counterclockwise). Then, using the fixed shaft 10 as a fulcrum, the other end 9b is moved in the direction of the arrow to release the engagement with the notch 8a of the control member 8.

Until now, the cylindrical body 5 rotating through the drive shaft 11 has been locked by the lock 8a of the control member 8 via a spring in contact with the circumference of the cylinder.
, 9b, the rotational driving force could not be transmitted to the claw-like member 7, but now the rotational driving force can be transmitted by the above-mentioned disengagement.

This was described in detail in the explanation of FIG. 1, and when in the locked state, the rotating cylindrical body 5 maintains a small gap between its cylindrical circumference and the spring, and the control member 8 which is interlocked with the cylindrical body 5 through the spring. Since almost no driving force is applied, the locked state can be easily released even with thin photosensitive paper or a weak synthetic photosensitive sheet. When the locked state is released, the rotating cylindrical body 5 moves on its cylindrical circumference. Since the cylindrical body is brought into contact with this spring by the constricting action of the spring, the rotational driving force of this cylindrical body is transmitted to the claw-like member 7, causing it to rotate.

Next, the preceding paper continues to advance along the guide plate 15, following the claws 7a of the claw-like members 7 as illustrated.

Therefore, the rotating speed of the claw 7a is made slower than that of the differential roller 14, which has a faster circumferential speed, so that the leading edge of the leading paper can be fed into the depth of the claw within about a quarter of the rotating distance.

However, if one end 9a of the swinging member is provided in the slot or on the side of the slot of the claw 7a, the circumferential speed may be the same as that of the faster differential roller.

Further, the direction of the photosensitive paper is changed by the guide of the claw 7a, and the document is directed to the developing process in cooperation with the guide roller 16 and a roller (not shown) coaxially mounted in parallel with the claw-like member 7, and the original is then moved almost straight. The liquid is discharged to the outside through a pair of discharge ports 17 and 18.

The claw-like member 7 is rotated by the movement of the spring, etc., and engages again with the other end 9b of the swinging member 9 and the notch 8a of the control member 8, weakening the tightness of the spring and moving during automatic separation. Stop all parts at normal locations.

Furthermore, even if the positions of the claws on the claw-like member are uneven or the movement of each claw is different, if the photosensitive paper is fed at a speed faster than the rotational drive speed, this device will not cause any problems. Since the claw-like member can be moved along the path of the paper without any problems, it is possible to achieve the purpose of protecting the paper, such as preventing problems caused by damage to the paper.

FIG. 4 shows another embodiment of an automatic separation device using the principle of FIG. 1B, in which FIG. 4A shows one side view of the device, and FIG. A sectional view taken in the direction of the arrow from the Harney line of A is shown, and FIG. 4C is the other side view.

5' is a rotating cylindrical body fixed to the drive shaft 11, 6' is a spring, a part of which is wound around the rotating cylindrical body 5', and the remaining part is wound around a sleeve of a claw-like member; is a claw-like member corresponding to the driven body in FIG.
It has 'a'.

This member is provided with a substantially ladder-shaped hole 19 in the illustration between the pawl 7'a and the shaft 11, and 8' is a control member having a recessed piece 20 at its head. .

The claw-like member 7' and the control member 8' are each coaxial with the cylindrical body 5', but are independently rotatably supported, and in this case, one end of the spring 6' is operationally fixed only to the control member 8'. (In the illustrated example, the other end is also inserted into the claw-like member 7', but as mentioned above, this is merely an auxiliary part.)

9' is a swinging member whose one end 21 is connected to the control member 8'.
is swingably attached to the support piece 20 of the other end 9.
'a' has a bifurcated shape, which is passed through the hole 19 of the claw-like member 7' and installed on the side of 7'a.

Further, one end 21 of the swinging member 9' is provided with an engaging piece 22 for placing the bifurcated end 9'a in a predetermined position, and an engaging piece 22 for smoothing the swinging motion of the end 9'a. It is equipped with a weight piece 23 for this purpose.

24 is attached to a machine frame (not shown), etc., and the above-mentioned engaging piece 22
The spring 6' is loosened via this member 9' and the control member 8' while the swing member 9' is stopped by engagement with the fixed member 24. Therefore, the torque applied to the control member 8' is extremely small, and the pawl member 7' also stops completely at a predetermined position.

When one end 9'a of the swinging member 9' is pushed by the advance of the paper, the engagement piece 22 on the other end of the swinging member 9' swings out from the fixed member 24 with an extremely light force. The control member 8' is rotatably connected to the cylindrical body 5 via the member 9'.
The rotation of the spring 6' tightens the spring 6', and a large driving force is applied to the claw member 7' together with the control member 8' and the swinging member 9'.

Since this claw-like member 7' corresponds to the driven member 3' in FIG. 1B, it is clear that it can be overrun in the forward rotational direction by an external force.

In addition, in FIG. 4, the first driven body in FIG. 1B is a claw-like member, but the same effect can be obtained even if the driven body and the claw-like member are separately provided and mechanically connected. Of course, it can be effective.

[Brief explanation of drawings]

FIG. 1A is a cross-sectional view explaining the principle of the automatic separation device of the present invention, FIG. 1B is a cross-sectional view explaining the principle of a modified example of the automatic separation device of the present invention, and FIG. FIG. 2B is a sectional view taken along the line ELO of FIG. FIG. 4A shows a side view of the separating device in two operating positions when installed; FIG. 4B is a side view of a second embodiment of the invention using the principle of FIG. 1B; FIG. 4A is a cross-sectional view taken from the line harness in FIG. 4A, and FIG. 4C is a side view on the opposite side of FIG. 4A. The main members in the figure are as follows. 1, 1'... Drive cylinder, 2, 2'...
Spring, 3, 3'... Driven body, 4, 4'
...Control member, 5,5'...Rotating cylindrical body, 6,6'...Spring, 7,7'...
...Claw-shaped member, 7a, 7'a...Claw, 8, 8
'...Control member, 8a...Notch, 9
, 9'... Swinging member, 9a, 9'a...
・End part, 9b, 9'b...Other end part, 22...
...Engagement piece, 24...Fixing member.

Claims (1)

[Scope of Claims] 1. After overlapping the original and the photosensitive paper and printing, the paper is fed at different speeds to cause a shift in the leading edges of both papers, and the leading edge of the leading paper is captured and the paper is moved in the direction of travel. In an automatic separating device of a copying machine, which separates both sheets by changing the rotation of the cylinder, a rotating cylindrical body is used, and a cylindrical body that is partially or wholly wrapped around the cylindrical body in a direction tightened by the rotation of the cylindrical body. A coiled spring, a control member that fixes one end of the spring and freely rotates coaxially with the cylindrical body, and a control member that can freely rotate coaxially with the cylindrical body and captures the leading edge of the paper to guide the course. a rotatable pawl member having a pawl for changing the spring and connected to the other end of the spring; and a swinging member that engages and disengages from the control member to stop and release its rotation, the inlet side of the pawl being connected to the other end of the spring. an automatic separating device for a copying machine, comprising: a swinging member having an end portion located at the paper and swinging in a direction to release the control member upon engagement with the paper. 2. An automatic separation device for a copying machine according to claim 1, wherein the spring and the claw member are connected by fixing the other end of the spring to the claw member or a member connected thereto. 3. A patent in which the spring and the claw member are connected by providing a circumferential surface coaxial with the cylindrical body on the claw member or a member connected thereto, and wrapping the other end of the spring around this circumferential surface. An automatic separating device in a copying machine according to claim 1.