KR940003980Y1 - Automatic paper supply device for fax - Google Patents

Abstract

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Description

Clutch Device for Automatic Paper Feeding of Office Equipment

1 is a block diagram showing a paper automatic feeding mechanism of a general office equipment.

Figure 2 is an exploded perspective view showing the configuration of a clutch device for automatic paper feeding of office equipment according to the prior art.

Figure 3 is a cross-sectional view showing the configuration of the clutch device for automatic paper feeding of office equipment according to the present invention.

4 is an exploded perspective view showing the configuration of FIG.

5a and b is a front view showing the configuration and operation of the clutch device for automatic paper feeding of office equipment according to the present invention.

6 is an enlarged view of a portion A of FIG.

* Explanation of symbols for main parts of the drawings

31: Feed Roller 34: Axis

35,37: spring seating groove 36: spring fixing plate

39, 43: uneven portion 40: drive gear

41: close contact 44: bush

47,47 ′: Vertical part 48,48 ′: Inclined part

The present invention relates to a clutch device for automatic paper feeding in office equipment, such as a facsimile machine, a laser beam printer, and a printer capable of mounting a plurality of sheets of paper, and more particularly, to ensure power transmission during forward feeding of paper. The present invention relates to a clutch device for automatic paper feeding of office equipment, which reduces the load during the reverse feeding operation, facilitates paper feeding operation, facilitates processing and production of parts, and extends the life of parts. .

Paper of general office equipment (Facsimile is 'original', hereinafter referred to as 'original') Automatic feeding mechanism, as shown in Figure 1, upper and lower guides (2) to guide the transfer of the original (1) (3), a feed roller 4 for conveying the original 1, a separation rubber plate 5 for contacting the feed roller 4 at a predetermined pressure to support the original 1, and the feed A feed roller 6 for feeding the original 1 past the roller 4, a reading device 7 for reading the contents of the original 1, and a document 1 past the reading device 7; Pressure plate (9) for supporting the elastic force of the compression spring (8), discharge roller (10) for discharging the document 1 past the reading device (7), the feed roller (4) and discharge roller (10) It is comprised by the pinch roller 11 and 12 which contact | connects respectively.

The automatic paper feed mechanism of such a general office equipment, when the transmission operation is started, the upper and lower guides (2) between the paper feed roller (4) and the pinch roller (11) loaded on the paper feed roller (4) (3) is fed, the contents are read by the reading device (7).

In this case, the document 1 passing through the reading device 7 is more stable in the feeding operation by the pressing plate 9 supported downward by the elastic force of the compression coil spring 8, and the document passing the reading device 7 ( 1) is discharged by the rotation of the discharge roller (10).

At this time, in the case of feeding a plurality of originals 1, the originals 1 should be graded in order to distinguish the leading and trailing ends of the original 1, and in general, the feed roller 6 is higher than the linear speed of the feed roller 6. It is a situation that the linear speed of the design is slow.

However, when the length of the document 1 is several times longer than the length of the entire transmission system (the length from the feed roller 4 to the discharge roller 10), the document 1 is fed by the feed roller 4 and the feed roller. As a result of the phenomenon of being engaged with (6) at the same time, the feed roller 4 is provided with a separate clutch device in case of being rotated faster than the speed received from the drive unit.

Referring to the accompanying drawings, a typical example of a clutch device for automatic sheet feeding according to the prior art is as follows.

As shown in FIG. 2, the feeding roller 4 is fixedly coupled to the shaft 21 having a predetermined length having a chamfer 20 of a predetermined length formed at one end thereof, and rotatably coupled to the shaft 21. A drive gear 23 having a boss 22 formed on an outer side thereof, and a bush 25 formed on an inner side thereof to be coupled to an instrument drive system, and fixed to an outer end of the shaft 21; It consists of a clutch spring 26 interposed between the drive gear 23 and the bush 25 to hold their bosses 22 and 24, respectively.

The clutch device for automatic sheet feeding is configured such that the clutch spring 26 is tightened in the forward direction in which the drive gear 23 is rotated in the direction of the arrow, so that the power of the mechanism drive system is driven by the drive gear 23 and the clutch spring ( It is transmitted to the bush 25 through the 26, the direction in which the clutch spring 26 is released when the drive gear 23 is rotated in the reverse direction, that is, when the bush 25 is rotated faster than the drive gear 23 Since the bush 25 and the drive gear 23 are rotated at different speeds, respectively.

In other words, in order to initially feed the document 1, the power of both mechanisms is transmitted in the order of the drive gear 23 → clutch spring 26 → bush 25 → feeding roller 4, After the tip of the document 1 is bitten by the feed roller 6, the power is transmitted in the order of the feed roller 6 → the document 1 → the feed roller 4 and then the bush 25. At this time, the bush 25 Is not transmitted to the drive gear 23 by acting in the direction in which the clutch spring 26 is released, and thus the bush 25 and the drive gear 23 are rotated at different speeds, and therefore the original 1 ) Is fed at the speed of the feed roller 4 without receiving a large load.

However, in the clutch device for automatic paper feed of office equipment according to the prior art as described above, the tolerance and the surface state between the drive gear 23 and the clutch spring 26 and the clutch spring 26 of the bush 25 are Therefore, the transmission torque in the forward direction and the residual friction force in the reverse direction must be strictly regulated. Therefore, there is a disadvantage in that the processing and production methods of the parts are not easy, and there is a limitation in the forward torque in the forward direction as well as the corresponding direction in the reverse direction. There was a disadvantage that the feeding operation of the document 1 was not smooth because residual friction was generated.

In addition, due to the wear and damage of the drive gear 23 and the bush 25 by the clutch spring 26, there are various problems such as shortening the life of the parts.

The present invention has been devised to solve the conventional problems as described above, the power transmission of the drive gear and the bush to be transmitted only in one direction in the form of a sawtooth to ensure the power transmission during the forward transfer operation as well as reverse transfer By reducing the load during operation, it is configured to facilitate the paper feeding operation, to facilitate the processing and production of parts, and to extend the life of the parts. As follows.

Figure 3 is a cross-sectional view showing the configuration of the clutch device for automatic paper feed of the office equipment according to the present invention, Figure 4 is an exploded perspective view showing the configuration of Figure 3, as shown therein, office equipment according to the present invention Clutch device for automatic paper feeding of the fixed length of the feed roller 31 is fixed to the one side end of the chamfer 32 of a predetermined length is formed and the fixed length of the fixed jaw 33 is formed inside the chamfer 32 A shaft 34, a spring fixing plate 36 rotatably coupled to the shaft 34 and a spring seating groove 35 formed on an outer surface thereof, and rotatably coupled to the shaft 34, and connected to an instrument drive system. An inner side spring seating groove 37 is formed, and interposed between the drive gear 40 and the spring fixing plate 36 and the drive gear 40 having a concave-convex portion 39 formed on the end face of the boss 38 on the outer side. Close contact with both ends of the spring seating grooves (35, 37) An uneven portion 43 which is fixed and coupled to rotate integrally with one end of the spring 41 and the shaft 34 and is joined to the uneven portion 39 of the drive gear 40 on the boss 42 end surface of the inner surface. It is composed of a bush 44 is formed, and the (E) ring 46 is inserted into the fixing groove 45 formed on one side end of the shaft 34.

As shown in FIG. 6, the uneven parts 39 and 43 of the drive gear 40 and the bush 44 are in the form of a cog wheel, and the vertical parts 47, 47 'and the inclined part 48, respectively. Each 48 'is formed so as to be completely joined, and in the state of being joined once, reverse rotation is impossible.

In addition, the contact spring 41 is fitted to the spring fixing plate 36 and the spring seating grooves 35 and 37 of the driving gear 40, respectively, is because the contact spring 41 is in the vertical direction of the shaft 34. This is to prevent flow with respect to, and if the contact spring 41 is eccentric to one side with respect to the shaft 34, the uneven parts 39 and 43 of the drive gear 40 and the bush 44 The engagement state will be shifted.

If described in detail by the accompanying drawings the effect of the clutch device for automatic automatic paper feed of the office equipment according to the present invention is configured as follows.

First, when the document is initially fed, as shown in FIG. 5A, when the drive gear 40 is rotated in the direction of the arrow shown by the power of the mechanism drive system, the drive gear 40 and the bush 44 are rotated. Of the uneven parts 39 and 43 are completely formed because the driving gear 40 is forced to the right in the drawing due to the elasticity of the spring 41 for close contact, and accordingly, by the rotation of the driving gear 40. Bush 44 is also rotated at the same speed, and the feed roller 31 is rotated by the rotation of the bush 44 to feed the document.

Subsequently, when the leading end of the original is driven at the feed roller 6 (shown in FIG. 1) at the speed of the feed roller 6 by the continuous feeding of the original, as shown in FIG. 5B on the contrary, Since the bush 44 rotates at a higher speed than the drive gear 40, the inclined portion 48 ′ of the bush 44 rises up the inclined portion 48 of the drive gear 40, thereby driving the gear. 40 is to repeat the elasticity of the close contact spring 41 and to be repeatedly pushed to the left in the drawing, so that the power of the bush 44 is no longer transmitted to the drive gear 40.

In one embodiment of the present invention as described above, the coupling sequence of each component to be coupled to the shaft 34 is the spring fixing plate 36 → clutch spring 26 → drive gear 40 → bush 44 → Although the ring 46 is not limited thereto, the order of coupling may be changed as in the following other embodiments.

① Drive gear (40) → bush (44) → clutch spring (26) → spring fixing plate (36) → tooth ring (46).

(2) Spring retaining plate (36), clutch spring (26), bush (44), drive gear (40), tooth ring (46).

③ Bush (44) → Drive gear (40) → Clutch spring (26) → Spring fixing plate (36) → Teeth ring (46).

In the case of ① and ②, the bush 44 is moved left and right during the reverse rotation, and in the case of ③, the drive gear 40 is moved left and right, and the operation is almost identical to that of the embodiment of the present invention. Since the same, detailed description thereof will be omitted.

As described above, the present invention has the advantage that power transmission is more accurately transmitted by transmitting power transmission of the drive gear and the bush only in one direction, and it is easy to process and produce the toothed drive gear and the bush. There is a repelling effect.

In addition, since the frictional portion is made of the same material, and the frictional force can be adjusted very small during relative friction, there is an effect of preventing the shortening of the life due to wear and extending the life.

Claims (3)

In the clutch device for automatic paper feeding of an office machine, a spring roller (36) rotatably coupled to a fixed shaft (34), and a mechanism driving system rotatably coupled to the shaft (34). And a contact spring 41 interposed between the driving gear 40 and the spring fixing plate 36 and the driving gear 40 having one side uneven portion 39 formed thereon, and one side of the shaft 34. Automatically feeding the paper of an office equipment, characterized in that the bush 44 is fixed to be integrally rotated at the end and formed with a concave-convex portion 43 to be joined to the concave-convex portion 39 of the drive gear 40 on one side. Jigging clutch device. According to claim 1, Spring mounting grooves 35, 37 are formed on one side of the drive gear 40 and the bush 44, respectively, characterized in that configured so that both ends of the clutch spring 26 is inserted and supported Clutch device for automatic paper feeding of office equipment. The concave and convex portions 39 and 43 of the drive gear 40 and the bush 44 are cogwheel-shaped, respectively, and the vertical portions 47, 47 'and the inclined portions 48 and 48', respectively. C) each formed is a clutch device for automatic paper feeding of the office equipment, characterized in that configured to be impossible to reverse rotation in the state once assembled.