JPS5924036Y2 - Device for shifting the leading edge of two sheets of paper that are fed out in a superposed manner - Google Patents

Description

[Detailed description of the invention] In order to separate two sheets of paper that are sent out from a delivery device in a mutually overlapping state, the leading edge of one paper is advanced by a predetermined amount from the other. Regarding the improvement of the shifting device for conveying the preceding paper to the next separating device, in detail, the dispensing device and the discharging device are arranged in the path of the two sheets of paper that have been sent out in a mutually overlapping state through a detour path. A constant speed roller that is driven at substantially the same circumferential speed throughout and conveys one paper at substantially the same speed as the feeding device, and a drive source that is forced to rotate at a circumferential speed greater than that of the roller are coupled via a connecting means,
The leading edge of the other paper is advanced by a predetermined amount than that of the one paper, and due to this leading, the load of the other paper that is tensioned between it and the feeding device releases the connection between the driving source and the connecting means, and thereafter, The present invention relates to an improvement in a shifting device in a machine provided with a pair of smoothing rollers, each consisting of a variable speed roller that rotates as a result of the rotational force of the constant speed roller and conveys the other paper to the next separating device.

In recent years, this type of shifting device has been widely used in copying machines that print original paper in close contact with photosensitive paper, as in, for example, Japanese Utility Model Publication No. 49-10844 or Japanese Utility Model Application No. 12540-1983.

The shifting device in this copying machine uses a smoothing roller to advance the photosensitive paper, and the photosensitive paper is tensioned between the printing device and the variable speed roller with a high circumferential speed, and the load caused by this tension causes the friction device or coupling means The coupling between the dog clutch and the drive source is released; in other words, in the case of a friction device, the coupling is released by creating a slip between the dog clutch and the drive source, and in the case of a dog clutch, the clutch is released. By doing so, the connection with the drive source is released, the load on the speed change roller due to the tension of the photosensitive paper is removed, and damage to the photosensitive paper is prevented.

However, after the connection between the coupling means and the drive source is released due to the load caused by the tension of the photosensitive paper, the variable speed roller becomes driven by the rotational force of the constant speed roller and moves the preceding photosensitive paper to the next separating device. The conveyance speed is a predetermined value determined by the relationship with the conveyance speed of the separation device, usually the circumferential speed is approximately the same as the seizure speed, and in the case of a friction device, it is set at a peripheral speed determined by the relationship with the conveyance speed of the separation device. In the case of dog clutches, it is not possible to maintain a constant speed due to the effect of disconnection of the drive source, resulting in a lower peripheral speed than necessary, and reliable conveyance to the next separation device is not guaranteed, resulting in poor separation. may lead to
Further, the stability was still poor in that it was not possible to maintain a predetermined amount of advance obtained before tensioning the photosensitive paper and transport it to the separation device.

As mentioned above, the object of the present invention is that when a load is applied to the speed change roller with a high circumferential speed due to the tension of the preceding paper, the connection between the drive source and the connecting means is released due to the load, and the speed change is caused by the tension of the photosensitive paper. Although the load on the roller is removed, after the connection is released, the peripheral speed of the speed change roller cannot be maintained at a predetermined value, and the peripheral speed of the speed change roller can be reduced to a smaller value. The object of the present invention is to control the drop in speed and ensure conveyance at a predetermined value, and its features include a drive system in the shifting device for forcing the variable speed roller to rotate at the same circumferential speed as the constant speed roller; Disposed between the drive system and the speed change roller, when the peripheral speed of the speed change roller is higher than the peripheral speed of the constant speed roller, the connection is not made, and when the peripheral speed decreases to the peripheral speed, the connection is made and the speed change roller is connected. A coupling means for forcibly rotating the drive system by the drive system is added.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 shows a contact printing copying machine to which the present invention is applied.
is provided, and a roller 4 is provided on one part of its outer periphery. 5. 6.
7. 8 and circumferentially surrounds a contact belt 9 which is rotationally driven in the direction of arrow a.

The original paper O and the photosensitive paper P are stacked and inserted between the cylinder glass 1 and the contact belt 9 from the insertion opening near the roller 4, and the exposure lamp 2 is ejected from the exit near the roller 7. A copy is printed by receiving the light of the

A guide plate 10 guides the original paper O and the photosensitive paper P along a detour, and a pair of smoothing rollers 11 and 12 are provided in front of the guide plate 10.

The smoothing rollers 11.12 are connected to shafts 13.1 supported on the side plates 24a and 24b of the machine body, respectively, as shown in FIG. 4a.
A plurality of pieces are fixed to each side plate 24a of the shaft 13.
A gear 25 is loosely fitted to the side end, and the side plate 24 of the shaft 14
A gear 26 is fixed to the end of the side a, and one side plate 24 a
A gear 28 is loosely fitted to a pin 27 provided in the
are driven in opposite directions.

In the above gear series, the gear 26 is the shifting roller 1
The circumferential speed of No. 2 is the speed of the copy printing section, that is, the contact belt 9.
The gear 25 is formed to have substantially the same driving speed as the gear 26, and the gear 25 is formed to have a smaller number of teeth than the gear 26.

A dog clutch 29 is integrally provided on the carrier 25, and a dog clutch 30 is loosely fitted to the end of the shaft 13, and a key 31 is provided on the dog clutch 30. The key groove 32 is engaged with and guided by the key 31, so that the dog clutch 30 can move in the axial direction, and the shaft 13 is further provided with a support plate 34 which is prevented from being pulled out with a retaining ring 33. A spring 35 is provided between the dog clutch 30 and the dog clutch 30.
0 is engaged and is constantly biased in the direction of engagement with the clutch 29.

As a result, when the above-mentioned meshing is achieved, the
The rotation is transmitted to the shaft 13, and the smoothing roller 11 is rotated in the opposite direction to the shifting roller 12 at a faster circumferential speed.

The meshing surface of the dog clutch 29, 30 has a fifth
An appropriate number of protrusions 36 are provided as shown in FIGS.
The joint surface of the projection 36 and its back surface are inclined at a predetermined angle with respect to the rotational force transmission direction.
, 30a, the engagement is maintained during normal operation, and the photosensitive paper P is put under tension between the smoothing roller and the copying/printing section as shown in Fig. 3, resulting in a large load. Sometimes, dog clutch 30 is immediately disengaged from dog clutch 29.

There is an automatic separation mechanism S in front of the path of both sheets after passing through the smoothing roller.
is provided, and the distal end is locked to a separating plate 16 coupled to the drive shaft 15 via a friction device, and a locking part 18 provided in a part of a step part 17 that is integrated with the separating plate 16. The original paper O and the photosensitive paper P are sent out from the smoothing rollers 11 and 12, and are moved forward along the guide plate 21 to stop the preceding photosensitive paper P. The other end of the stopper 20 is brought into contact with the other end of the stopper 20, and the stopper 20 is moved against the locking portion 18 as shown in FIG. The insertion portion 22 formed on the separating plate 16 is exposed so as to face the leading edge of the photosensitive paper p which is further advanced.

In addition, when the separation plate 16 rotates, the speed of the engaging portion 22 is the same as the speed of the engaging portion 22 at the leading end of the photosensitive paper p when the photosensitive paper p is tensed.
2, and the amount of penetration is related to the amount of penetration into the photosensitive paper p after separation.
If it is easy to remove the tip of the photosensitive paper from the engaging part 22, set it to approximately the same speed as the printing speed, and if the engaging amount is larger than that, the photosensitive paper p will be released from the engaging part 22 after tensioning. It is set slightly faster than the printing speed, taking into consideration the amount of movement for guiding the tip of the guide and the ease of detachment at the guide end position.

As shown in FIG. 3, the separating plate 16 rotates with the leading edge of the photosensitive paper P being engaged in the engaging part 22 of the unlatched separating plate 16, and at this time, the original paper O is inserted into the engaging part 22 of the separating plate 16. The photosensitive paper p is separated from the path of the photosensitive paper p without intervening with the separation plate 16 and the opposing roller 23 (not shown) coaxial with the separation plate 16.
After passing through the gap in FIG. 1), it leaves the insertion section 22 and advances to the developing section.

The above is a scheme disclosed in Japanese Utility Model Application Publication No. 52-12540, which exemplifies a dog clutch as a coupling means that is disconnected from the drive source by the load caused by the tension of the photosensitive paper p. Due to the tension load, the smoothing roller 11 immediately separates from the engagement with the dog clutch 29, and as a result, the peripheral speed of the smoothing roller 11 decreases, and the load caused by the tension of the photosensitive paper p is removed. The rotation is driven by the rotational force of the shifting roller 12, and the photosensitive paper p whose leading end has already entered the engagement portion 22 of the separation plate 16 by a predetermined amount can be continuously conveyed at a circumferential speed that is approximately the same as the printing speed. However, in reality, due to the disengagement of the dog clutch, the smoothing roller 11 becomes lower than the circumferential speed of the smoothing roller 12, and the conveying speed of the photosensitive paper p becomes slower than the printing speed, so that it engages in the engaging portion 22 of the separating plate 16. As the amount of engagement of the leading edge of the photosensitive paper decreases, the leading edge of the photosensitive paper P may eventually come off the engaging portion 22 of the separating plate 16, resulting in poor separation.

Furthermore, even if a friction device such as that disclosed in Japanese Utility Model Publication No. 49-10844 (not shown) is provided between the shaft 13 of the smoothing roller 11 and the gear 25 instead of a dog clutch as the connecting means, the photosensitive paper can be The circumferential speed of the smoothing roller 11 may become lower than that of the smoothing roller 12 due to changes over time due to wear of the friction members of the friction device due to the load caused by the tension of the smoothing roller 12, which may similarly cause poor separation.

Therefore, in the present invention, as shown in FIGS. 4a and 4b,
A gear 37 is fixed to the end of the side plate 24b of the shaft 14, and a gear 38 is loosely fitted to the end of the side plate 24b of the shaft 13. The rollers are configured to rotate at the same speed in opposite directions, and are connected between the gear 38 and the smoothing roller 11 when the circumferential speed of these rollers 1 to 11 decreases to the circumferential speed set by the gear 38. Coupling means 39 are provided for coupling the shaft 13 of the roller 11 to the gear 38.

In the embodiment, a one-way clutch provided integrally with the gear 38 is used as the coupling means 39, and when the circumferential speed of the L roller 11 is higher than that of the gear 38, the clutch 39 The shaft 1 does not connect with the shaft 13, but conversely connects with the shaft 13 when the circumferential speed of the gear 38 decreases, thereby transmitting the driving force of the gear 38 to the shaft 13.
3.

With the above configuration, due to the load caused by the tension on the photosensitive paper p,
The dog clutch 29.30 is disconnected and the smoothing roller 1
The circumferential speed of the smoothing roller 11 decreases and is about to become lower than the circumferential speed of the smoothing roller 12, but at this time, the one-way clutch 39 and the shaft 13 of the smoothing roller 11 are connected, and the driving force of the gear 38 causes The buffing roller 11 is forcibly rotated at the same circumferential speed as the buffing roller 12, that is, approximately the same as the printing speed, so that the leading edge of the photosensitive paper P does not come off the insertion part 22 of the separating plate 16, and separation can be performed without any trouble. be exposed.

As described above, the present invention provides, in a conventional shifting device, a drive system for forcibly rotating the speed change roller at the same circumferential speed as the constant speed roller, and disposed between the drive system and the speed change roller, A coupling means is added that does not connect when the peripheral speed of the speed change roller is higher than the peripheral speed of the constant speed roller, but connects when the peripheral speed decreases to the peripheral speed to forcibly rotate the speed change roller by the drive system. Although this method restricts the reduction in the circumferential speed of the variable speed roller, it does not interfere with the separation operation in the next separation device, and also prevents the predetermined amount (maximum) of advance obtained before tensioning the photosensitive paper. It has the advantage that it can be maintained and transported to the next separation device.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a contact printing copying machine to which the present invention is applied, Figs. 2 and 3 are cross-sectional views showing the situation in which the original and the photosensitive paper are shifted and separated, and Fig. 4 is a cross-sectional view of the contact printing copying machine to which the present invention is applied. FIG. 5 is a plan view showing the driving means of the smoothing roller, FIG. 5 is a side view of the main part, and FIGS. 5 and 6 are plan views showing the operating state of the dog clutch. 0...Original drawing paper, p...Photosensitive paper, 1...
... Cylinder glass, 9 ... Contact belt, 10 ... Guide plate, 11 ... Smooth roller (speed change roller), 12 ... Even roller (constant speed roller), 13.14...shaft, 21.
22.23°37, 38,... Gear, 26.
27... Dog clutch, 39...
One-way clutch (coupling means), S...Separation device.

Claims (1)

[Claims for Utility Model Registration] 1. Two sheets of paper are sent out through a detour route from a delivery device in a mutually overlapping state, and one of the sheets is driven at substantially the same circumferential speed as the delivery device from start to finish. A constant-speed roller that conveys at approximately the same speed as the feeding device, a drive source that forcibly rotates at a circumferential speed greater than that of the roller, and the plate are connected via a connecting means, so that the leading edge of the other paper is lower than that of one of the sheets. is caused to advance by a predetermined amount, and due to the advance, the load of the other paper that is tensioned between it and the feeding device causes the connection between the drive source and the connecting means to be released, and thereafter the rotation is driven by the rotational force of the constant speed roller. a drive system for forcibly rotating the variable speed roller at the same circumferential speed as the constant speed roller; Disposed between the drive system and the speed change roller, when the peripheral speed of the speed change roller is higher than the peripheral speed of the constant speed roller, the connection is not made, and when the peripheral speed decreases to the peripheral speed, the connection is made and the speed change roller is connected. A device for shifting the leading edges of two sheets of paper fed out in an overlapping manner, characterized in that the device comprises a coupling means for forcibly rotating the speed roller by the drive system, and restricts a decrease in the circumferential speed of the speed change roller. 2. The drive system includes a drive gear fixed to the shaft of the constant speed roller and a driven gear meshed with the gear and rotatably provided to the shaft of the speed change roller, and the coupling means includes the drive gear fixed to the shaft of the constant speed roller. The driven gear is disposed between the driven gear and the shaft of the speed change roller, and when the peripheral speed of the speed change roller is higher than the peripheral speed of the constant speed roller, it is not coupled, and when the peripheral speed decreases to the peripheral speed, it is connected and the driven gear is connected. Utility model registration claim 1 consisting of a connecting member that integrally rotates a gear and the shaft of the speed change roller
A device for shifting the leading edges of two sheets of paper that are fed out in a superposed manner as described in Section 1. 3. The connecting member comprises a one-way clutch fixed to the driven gear that is rotatably provided on the shaft of the speed change roller. Tip shifting device. 4. Utility model registration claim 1, characterized in that the sending device comprises a printing device, and the machine is a copying machine.
4. A device for shifting the leading edges of two sheets of paper that are fed out in a superposed manner according to any one of items 1 to 3. 5. The device for shifting the leading edges of two sheets of paper fed out in a superimposed manner as claimed in claim 4, wherein the connecting means includes a dog clutch. 6. The device for shifting the leading edges of two sheets of paper that are delivered in a superimposed manner as claimed in claim 4, wherein the connecting means includes a friction device.