JPS61229728A - Paper feeder - Google Patents

Abstract

PURPOSE:To prevent the generation of tooth jump sound by fixing one end of a spring coiledly mounted around the boss portion of a gear loosely fit on a load shaft and around a clutch shaft integral with the load shaft to the clutch shaft and projecting the other end of the spring through a hole in a ratchet. CONSTITUTION:One end 14a of a spring 14 coiledly mounted around the boss 11a of a gear 11 loosely fit on a load shaft 1a' and a clutch shaft 13 integrally fixed thereto at the end thereof is fixed to the flange of the shaft 13 and the other end 14b of the spring 14 is projected through a hole 16 in a ratchet 15 loosely fit on the circumference of the spring 14. In case when a clutch 12 is rotated in a direction shown by an arrow (b) by the reverse drive of a motor, the projected end 14b of the spring 14 is not pushed by the periphery of the hole 16 and therefore the spring 14 is not biased, because said one end 14a of the spring 14 fixed to the shaft 13 integral with the shaft 1a' is not rotated together with the gear 11 by a load on the shaft 1a', allowing the gear 11 to be freely rotated with respect to the shaft 1a', which prevents the generation of tooth jump sound even when the ratchet 15 is kept engaged by a stopper 17 in the reverse rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device suitable for being installed in a copying device or equipment such as a document feeding device mounted thereon.

[Background of the invention]

Generally, the above-mentioned equipment is provided with a paper feeding device that separates and feeds sheets of paper stacked in a stamper one by one from the upper layer. When the drive source of this paper feeding device is shared with the drive source of another mechanism, and when the operation of the other mechanism requires forward and reverse rotation, a forward/reverse motor may be used as the drive source. Even in such a case, the paper feeding mechanism needs to be able to rotate only in the paper feeding direction. In other words, it is necessary to transmit the drive to the load shaft of the sheet feeding mechanism only when the drive source rotates in the normal direction, and not to transmit the drive when the drive source rotates in the reverse direction.

In paper feeding mechanisms using such drive sources, spring clutches have been used as a drive transmission method for the load shafts. This conventional spring clutch has a boss part of a gear loosely fitted around a load shaft, a spring wound around a clutch shaft integrated with the load shaft, and one end of the spring free, and the other end loosely fitted around the outer periphery of the spring in a ratchet hole. I was allowed to go out from there. Therefore.

In the case of this spring clutch, when the drive source rotates forward and reverse, it operates as follows.

A) When the drive source rotates in the normal direction.

■If you lock the stopper to the ratchet and restrict its rotation, the ratchet will not rotate and the spring will not tighten, so the gear and load shaft will not be linked.

■When the stopper is removed from the ratchet and the ratchet rotates with the gear, the spring tightens and unites the gear and the load shaft.

B) When the drive source is reversed.

One end of the free spring moves in the tightening direction, and as a result, the spring tightens, uniting the gear and the load shaft.

Therefore, in the case of a conventional spring clutch, there is no problem with the function when the drive source rotates in the normal direction, but when the stopper is engaged with the ratchet during reverse rotation, the rotation of the ratchet causes
There was a problem in that the tooth skipping noise occurred.

[Purpose of the invention]

This invention is intended to solve the above-mentioned problem, and aims to provide a paper feeding device in which the ratchet does not rotate even if the stopper is engaged with the ratchet when the drive source is reversed, and the ratchet does not generate skipping noise. There is.

[Structure of the invention]

In order to achieve the above object, the present invention fixes one end of a spring wound around a boss part of a gear loosely fitted to a load shaft and a clutch shaft integral with the shaft to the clutch shaft, and fixes the other end to the outer periphery of the spring. It is configured to include a spring clutch that comes out from a loosely fitted ratchet hole.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

In the figure, reference numeral 1 denotes a document feeding device, and the document feeding device 1 has a first paper picking section 1a that separates and sends out documents 3 on a document table 2 one by one from the top surface, and a second paper feeding section 1a. It consists of a second paper pick-up section 1b that supplies the sent-out original toward the conveyor belt 4. A drive shaft of the second paper feed section tb (hereinafter referred to as the drive shaft)
1b' is connected to a drive source 5 via a belt 6.

Drive shaft (hereinafter referred to as load shaft) s of the -th paper picking section 1a
A spring clutch 12 is installed at la', and the spring clutch 12 has a gear 11 meshed with a gear 7 fixed to the drive shaft 1b' via an intermediate gear 1O. Further, the conveyor belt 4 connects a gear 42 fixed to the shaft end of the drive roller 41 via an intermediate gear 43 to the drive shaft 1b'.
It meshes with gear 7. This conveyor belt 4 is fed from the paper feeder 1, and when rotating a large original in the normal direction, it is placed on the original glass 44.
The scale plate 4 is introduced upward and then reversed to convey the original in the reverse direction.
The document conveying device operates so as to abut against the stepped portion 45' of the drive shaft 1b', and the drive source 5 of the drive shaft 1b' includes a forward/reverse motor to operate the conveyor belt 4. ing.

The spring clutch 12 is configured to drive and transmit only the rotation of the forward/reverse rotation motor 5, which is the drive source, to the load shaft 1 al during the forward rotation, and not to do so during the reverse rotation. has been done. That is, the load shaft 1 aI
The boss portion 11a of the gear 11 loosely fitted to the load shaft 1
One end 14a of the spring 14 wound around the clutch shaft 13 which is integrally fixed to the shaft end of the clutch shaft 13 is fixed to the flange of the clutch shaft 13, and the other end 14b is loosely fitted to the outer periphery of the spring from the hole 16 of the ratchet 15. (see FIG. 4), therefore, the spring clutch 12 is shown in FIG.
ff, when the gear 11 is rotating in the forward rotation direction (direction of arrow a) due to the forward rotation drive of the forward/reverse rotation motor 5, and the stopper 17 is locked to the ratchet 15 (■ in the figure). In this case, the ratchet 15 does not rotate, and the outer end 14b of the spring 14 is inserted into the hole 1 of the ratchet 15.
Since the spring 14 is not pressed by the edge of the gear 6, the gear 11 rotates freely with respect to the load axis la'. On the other hand, ratchet 15 as shown in the same figure
When the stopper 17 comes off, the chain end 15 rotates with the gear 11, and the outer end 14b of the spring 14 is pushed by the edge of the hole 16, so the spring 14 is tightened and the gear 11 is integrated with the load shaft 1a'. Become. Further, the spring clutch 12 is fixed to the clutch shaft 13 integrated with the load shaft 11a' when the gear 1 is rotated in the reverse direction (in the direction of the arrow) by the reverse rotation drive of the forward/reverse rotation motor 5 as shown in FIG. Since the one end 14a of the spring 14 that is attached does not rotate with the gear 11 under the load of the load shaft 1at, the outgoing end 14b of the spring 14 is not pressed by the edge of the hole 16 of the ratchet 15, so the spring 14 is not tightened. First, the gear 11 freely rotates with respect to the load shaft 1aI. Therefore, even if the stopper 17 remains locked to the ratchet 15 during reverse rotation.

No tooth-skipping noise is generated. Furthermore, since the clutch shaft 13 may rotate slightly in the opposite direction at the moment the gear 11 switches from normal rotation to reverse rotation, one end 14a of the spring 14 may rotate at that time. If the other end 14b is restricted by the edge of the hole 16 of the ratchet 15, the spring 14 may tighten and the gear and the load shaft may become integrated, so this can be effectively prevented. Therefore, the hole 16 of the ratchet 15 is made large so that even if the clutch shaft 13 rotates slightly, the other end of the spring 14a does not come into contact with the edge of the hole 16 of the ratchet 15.

Reference numeral 18 denotes an actuation mechanism for the stopper 17, and the actuation mechanism 1
8 uses a solenoid 19 as a driving source.

When the solenoid 19 is turned on, the stopper 17 is removed from the ratchet 15, and when the solenoid 19 is turned off, it is engaged with the ratchet 15.

In the above embodiment, the forward/reverse rotation motor 5 is turned on by pressing a document feeding start button (not shown). At the same time, the solenoid 19 is also turned on. The switching of the motor 5 from forward rotation to reverse rotation and the reverse rotation OFF operation are performed by detecting an encode plate that also serves as the cooling fan 20 of the forward and reverse rotation motor 5 using a photo sensor 21.

A counter (not shown) that counts its pulse output
A memory device (not shown) that stores the output and number of pulses in advance
The outputs of are compared by a comparator (not shown), and when they match, the output signal of the comparator is used.

Further, a document detection sensor (not shown) is provided on the document path between the first paper feed section 1a and the second paper feed section 1b. The document detection sensor turns ON when the leading edge of the document passes.
L, OFF when the rear edge of the document passes L, then ON
The solenoid 19 is turned off by the signal, the stopper 17 is engaged with the ratchet 15 of the spring clutch 12, the load shaft 5a1 and the gear 11 are freed, and the sheet feeding operation is stopped. Further, when the document detection sensor detects the trailing edge of the document and outputs an OFF signal, a counter that counts the pulse output from the photosensor 21 is activated. That is, the document fed through the paper feed section is counted until its trailing edge passes the top surface of the scale plate 45 and reaches an appropriate position on the surface of the document glass 44. When it reaches this point, it is reversely conveyed and the trailing edge of the document is counted. The number of reversal pulses until it hits the stepped portion 45' of the scale plate 45 is counted. During this reverse drive, the spring clutch 12 is operated and no transmission is made to the load shaft.

〔Effect of the invention〕

As is clear from the above description, the present invention fixes one end of a spring wound around the boss portion of a gear loosely fitted on a load shaft and a clutch shaft integral with the shaft, and fixes the other end of the spring to the clutch shaft. It is characterized by a spring clutch that comes out from the ratchet hole that is loosely fitted on the outer periphery, so even if the stopper is engaged with the ratchet when the drive source is reversed, the ratchet will not rotate, causing a skipping sound. This has the excellent effect of not causing any damage.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a sectional view of the paper feeding mechanism, Fig. 2 is a perspective view of the main parts, Fig. 3 is a sectional view of the spring clutch, and Fig. 4 is an external plan view thereof. Figure 5 r,
n is the action diagram of the spring clutch when the drive source rotates in the normal direction, Figure 6 is the action diagram of the spring clutch when the drive source is reversed, and Figures 7 and 8 are the operation diagrams of the stopper when the drive source is rotated in the normal direction. FIG. 1.-Paper feeding mechanism 1a-.-First paper feeding section 1a/,-
Drive shaft 1b--Second paper feed section lb'--Load shaft 5--Drive source (forward/reverse motor) 11-Gear
lla ---Boss portion 12 --- Spring clutch 13 --- Clutch shaft 14 --- Spring 14a
-・=One end 14b -Other end (protruding end) 15-・
Ratchet 16- Hole 17- Stopper 19... Solenoid patent
Applicant Konishiroku Photo Industry Co., Ltd. Figure 1 l Figure 3 Figure 4 Figure 5 (I) (If) Figure 6 Figure 7 Figure 8

Claims (2)

[Claims] (1) One end of the spring wound around the boss part of the gear that is loosely fitted on the load shaft and the clutch shaft that is integrated with the shaft is fixed to the clutch shaft, and the other end is inserted through the hole of the ratchet that is loosely fitted on the outer periphery of the spring. A paper feeding device characterized by being equipped with a spring clutch that can be moved out. (2) The ratchet hole is enlarged to a size that prevents it from coming into contact with the outer end of the spring even if there is a slight rotation when the gear loosely fitted to the load shaft rotates in reverse. Paper feeding device according to scope 1.