JPH0723616Y2 - Torque limiter for paper feeders such as office equipment - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is mainly used for a portion that transmits a relatively low torque, such as a paper feed mechanism of an office equipment such as a facsimile, an electronic copying machine, a printer of an OA equipment. The present invention relates to a torque limiter for a paper feeding device such as office equipment that can be easily attached to and detached from a rotary shaft.

(Prior Art) Conventionally, a coil spring is interposed between an input shaft and an output shaft in a torque limiter used in a paper feeding device for office equipment of this type, and a reverse torque larger than a rotational torque input from the input shaft is used. When the rotation torque is applied to the output shaft side, the torque input from the input shaft is not transmitted to the output shaft, and the reverse rotation torque applied to the output shaft side is greater than the rotation torque input from the input shaft. When the value becomes smaller, many so-called spring clutches are used in which the rotational torque input from the input shaft is transmitted to the output shaft.

In recent years, due to the spread of office equipment such as facsimiles and electronic copying machines, the demand for torque limiters used in paper feeders of these office equipment has increased rapidly, and low-cost and highly reliable products are required. .

However, the torque limiter using the spring clutch as described above has a poor structural reliability due to the fact that the torque tends to fluctuate due to a slight difference in dimensional accuracy and the influence of humidity.

In order to address such difficulties, the applicant of the present application
As No. 3937, focusing on a metal plate having a hysteresis characteristic, that is, a his plate, a torque limiter having a structure in which the his plate and a magnetic material are used, and a planetary gear mechanism for increasing the speed is combined is proposed. However, in this planetary gear support structure, the center of rotation must be accurately determined, and a considerably high dimensional accuracy is required for the support member of the planetary gear, resulting in high component manufacturing costs.

Furthermore, the applicant of the present application has proposed, as Japanese Patent Laid-Open No. 63-47523, a planetary gear support structure having an automatic centering function in order to address such a technical problem.

(Problems to be Solved by the Invention) The above-mentioned two inventions and inventions respectively achieve the intended purpose and exert useful effects, but recently, office work such as facsimile and electronic copying machine. Equipment tends to be more and more miniaturized, and naturally, a torque limiter of this kind used in these devices is also required to be compact.

However, in the two cases proposed as the prior art, the existence of the planetary gear mechanism incorporated for increasing the speed is an obstacle to further downsizing the entire torque limiter.

Further, although these two cases are configured to be attachable to and detachable from the rotary shaft, they also have a problem that durability is not so high because both the rotary shaft side and the bearing side are made of resin.

For example, comparing surface pressure durability under constant speed,
Compared to the case where both the rotating shaft side and the bearing side are made of polyacetal resin, the value is about 4 when the rotating shaft side is made of metal such as stainless steel and the bearing side is made of polyacetal resin.
Since the rotating shaft is usually made of metal, it is desirable to directly support the rotating shaft with a resin bearing portion.

Also, if a torque within a range that can be supported even if there is no planetary gear mechanism for speedup is required, even if a torque limiter with a simple configuration without the planetary gear mechanism is used, there is no problem. Since it does not exist, it is possible to configure it with a combination of a metal rotating shaft and a resin bearing part.
~ The ones shown in Figure 12 are also conceivable.

To briefly explain this, like the present invention, the rotary shaft 1
An engaging projection 8 provided on the rotating shaft 1, a magnetic body supporting cylinder 2, a cutout groove 9 formed in the magnetic body supporting cylinder 2, and a cylindrical shape attached to the outer peripheral surface of the magnetic body supporting cylinder 2. Magnetic body 3, a hiss plate 5 attached to the inner peripheral surface of a cylindrical casing 4 rotatably supported on the rotating shaft 1, and a guide formed on a bearing portion 6a of one side plate 6 of the casing 4. And a groove 7.

However, since the structure shown in FIGS. 10 to 12 has a configuration in which the outer opening 7a and the inner opening 7b of the guide groove 7 are linearly communicated with each other, the rotary shaft 1 moves toward the guide groove 7 side. When it tries to escape, it causes a core deviation, and it practically does not function as a bearing.

(Means for Solving Problems) The present invention has been devised to address such problems, and includes a rotary shaft 1 and an engagement projection 8 provided on the rotary shaft 1.
The magnetic body support cylinder 2, the notch 9 formed in the magnetic body support cylinder 2, the cylindrical magnetic body 3 attached to the outer peripheral surface of the magnetic body support cylinder 2, and the rotatable shaft 1 rotatably. The His plate 5 attached to the inner peripheral surface of the supported cylindrical casing 4 and the casing 4
The outer opening 7a formed in the bearing 6a of the one side plate 6 and the guide groove 7 in which the inner opening 7b is in phase constitute a torque limiter main body, and in addition to this, the magnetic support tube 2 and Instead of the magnetic body 3 attached to the magnetic body support cylinder 2, a cylindrical plastic magnet 3a is used to integrally form them, or the positional relationship between the magnetic body 3 and the hiss plate 5 is reversed.

(Operation) In order to attach the torque limiter having the above-described configuration to the rotary shaft 1, the bearing portion in which the rotary shaft 1 is formed on the side plate 6 of the casing 4
When the engaging protrusion 8 is inserted into the casing 6a and pushed in gradually with the engaging protrusion 8 facing the outer opening 7a of the guide groove 7, the engaging protrusion 8 enters the casing 4 while being guided by the guide groove 7.

That is, the engaging projection 8 is guided while moving in a spiral or crank shape, and at this time, the rotating shaft 1 is rotated by the amount that the outer opening 7a and the inner opening 7b of the guide groove 7 are in phase with each other. Therefore, it is inserted into the casing 4.

Then, in that state, the rotary shaft is further pushed to engage the engaging projection 8 with the notch groove 9, and the casing 4 is fixed from the outside of the local side plate by an appropriate means such as an E-ring 12.

The operating condition of the torque limiter body will be described. When no load is applied to the casing 4, the torque limiter body also rotates with the rotation of the rotating shaft 1, and the magnetic substance 3
When the casing 4 is loaded with a load equal to or higher than the hist torque generated between the plastic magnet 3a and the his plates 5, 5a, the casing 4 idles.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings. 1 is a rotating shaft, and a parallel pin for forming an engaging projection 8 on the rotating shaft 1. 11 is attached through.

Reference numeral 2 denotes a resin-made magnetic body support cylinder, which has a cutout groove 9 formed at one end thereof. The engagement projection 8 is engaged with the cutout groove 9 to move the magnetic body support cylinder 2 into the rotary shaft 1. Support.

Reference numeral 3 denotes a magnetic material, specifically, a cylindrical sintered ferrite magnet, which is fixed to the outer peripheral surface of the magnetic material supporting cylinder 2 by adhesion.

A resin casing 4 has a bottomed cylindrical shape, and a bearing portion 4a is formed on the other side plate corresponding to the bottom portion.

Reference numeral 5 denotes a metal plate having a special hysteresis, that is, a hiss plate, which is adhered to the inner peripheral surface of the casing 4 while facing the outer peripheral surface of the magnetic body 3 with a proper gap. Historque is generated between the magnetic bodies 3.

Reference numeral 6 denotes one side plate of the casing 4, which is fixed to the casing 4 by an appropriate means such as welding or adhesion, and a bearing portion 6a is formed on the one side plate 6.

Reference numeral 7 denotes a guide groove that allows the engagement protrusion 8 to pass therethrough. The outer opening 7a and the inner opening 7b of the guide groove 7 are formed in phase with each other by the width of the guide groove 7. , Outer opening
7a and the inner opening 7b are in spiral communication with each other.

Further, between the inner opening 7b of the guide groove 7 and the notch 9 formed in the magnetic body support cylinder 2, the engaging projection 8 which is guided by the guide groove 7 and has entered the casing 4 can rotate. Further, the clearance 10 that is slightly wider than the thickness of the engaging projection 8 is held.

Next, a second embodiment of the present invention will be described with reference to FIG. 5 of the accompanying drawings. This second embodiment is a combination of the magnetic body support cylinder 2 and the magnetic body 3 in the construction of the first embodiment. Instead, both are integrally formed with a plastic magnet 3a.

Further, in explaining the third embodiment of the present invention, this third embodiment is shown in FIG. 6 of the accompanying drawings. This is because the positional relationship between the magnetic body 3 and the hiss plate 5 is reversed, It is assumed that the magnetic body support cylinder 2 of the embodiment is a his plate support cylinder 2a, the his plate 5a is adhered and fixed to this, and the magnetic body 3b is attached to the inner peripheral surface of the casing 4. Furthermore, a seventh modification of the first to third embodiments is provided.
As will be described with reference to the drawings, in this modification, the outer opening 7a and the inner opening 7b of the guide groove 7 are not connected in a spiral shape as described in each of the above embodiments, and these are not connected. It is assumed that they are connected in a crank shape.

Next, an application example in which the torque limiter of the present invention is applied to a sheet feeding device of an electronic copying machine will be described with reference to FIGS. 8 to 9. R ₁ and R ₂ are rubber rollers, and the rubber roller R ₁ , R ₂ are arranged in contact with each other, of which,
The upper rubber roller R ₁ is directly connected to the drive shaft K of the drive motor M.

Also, the rubber roller R ₂ in the lower part is the torque limiter body T
The rotary shaft 1 is attached so as to move integrally with the casing 4 and supports the drive shaft K and the torque limiter body T, and a sprocket and a pulley are supported respectively.

A chain or belt is hung on the sprocket or pulley to transmit the rotational torque of the drive shaft K to the rotary shaft 1.

Thus, when one sheet is properly fed to the sheet feeding device, the rotation torque of the drive shaft K is transmitted to the rubber roller R ₁ and the rotation shaft 1 in the upper stage. rubber roller R ₁ of the rubber roller R ₂ of the lower part via the one sheet upper part
Since it is in pressure contact with the frictional rotation torque,
Becomes larger than the rotation torque transmitted from the torque limiter main body T to the rubber roller R _{2 at the} lower stage, which rotates in the opposite direction to the rotation direction of the rotation shaft 1.

When two or more sheets are fed, the sheets slip each other and the friction rotation torque is not transmitted from the upper rubber roller R ₁ to the lower rubber roller R _2, and the rotation torque of the rotary shaft 1 is reduced. There is transferred to the rubber roller R ₂ of the lower part via a torque limiter body T, rubber roller R ₂ in the lower part rotates in the same direction as the rotary shaft 1, to discharge the unwanted paper.

(Effect of the Invention) The present invention has a rotating shaft 1, an engaging projection 8 provided on the rotating shaft 1, a magnetic body supporting cylinder 2, a cutout groove 9 formed in the magnetic body supporting cylinder 2, and a magnetic body. The cylindrical magnetic body 3 attached to the outer peripheral surface of the support cylinder 2, the hiss plate 5 attached to the inner peripheral surface of the cylindrical casing 4 rotatably supported on the rotating shaft 1, and the casing 4 A guide groove 7 in which the outer opening 7a and the inner opening 7b formed in the bearing portion 6a of one of the side plates 6 are in phase makes up a torque limiter body.
And instead of the magnetic body 3 attached to the magnetic body support cylinder 2,
By integrally forming these with the cylindrical plastic magnet 3a or by arranging the magnetic body 3 and the hiss plate 5 in a reverse positional relationship, it is possible to use a combination of a metal rotating shaft and a resin bearing portion. A highly durable bearing means can be employed and the desired torque can be met with a minimum magnitude.

Further, since the torque limiter can be attached and detached by a simple operation, various effects are exhibited, such as easy maintenance of various devices incorporating the torque limiter.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view, FIG. 2 is a left side view, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 2 is an enlarged perspective view taken along the line AA of FIG. 2, FIG. 5 is a vertical sectional view showing the second embodiment, FIG. 6 is a vertical sectional view showing the third embodiment, and FIG. FIG. 8 is a schematic perspective view, FIG. 8 is a schematic perspective view, FIGS. 9 (A) and 9 (B) are explanatory views of a paper feeding state, and FIGS. FIG. 10 is a longitudinal sectional view, FIG. 11 is a left side view, and FIG. 12 is a sectional view taken along the line BB of FIG. Code table 1 ... Rotary shaft, 2 ... Magnetic support cylinder 2a ... Hiss plate support cylinder 3,3b ... Magnetic material 3a ... Plastic magnet 4 ... Casing, 4a ... Bearing part 5,5a ... His plate, 6 ... One side plate 6a ... Bearing, 7 ... Guide groove 7a ... Outer opening, 7b ... Inner opening 8 ... Engaging projection, 9 ... Notch groove 10 ... Clearance, 11 …… Parallel pin 12 …… E ring, K …… Drive shaft M …… Drive motor, R ₁ , R ₂ … Rubber roller T …… Torque limiter body

Claims (6)

[Scope of utility model registration request] 1. A rotating shaft 1 is provided with an engaging projection 8, a magnetic member supporting cylinder 2 is formed with a notch groove 9, and the engaging protrusion 8 is engaged with the notch groove 9 so that the rotating shaft 1 is made of a magnetic material. A support plate 2 is supported, a cylindrical magnetic body 3 is attached to the outer peripheral surface of the magnetic support tube 2, and a hiss plate is attached to the inner peripheral surface of a cylindrical casing 4 that is rotatably supported with respect to the rotating shaft 1. In the torque limiter in which the guide groove 7 is attached to the bearing portion 6a of the one side plate 6 of the casing 4 to allow passage of the engaging projection 8 provided on the rotating shaft 1, the outer side of the guide groove 7 Opening 7a and inner opening 7b
A torque limiter for a paper feeding device for office equipment or the like, characterized in that and are phased to be wider than the width of the guide groove 7. 2. A rotary shaft 1 is provided with an engaging projection 8, a cylindrical plastic magnet 3a is formed with a notch groove 9, and the engaging projection 8 is engaged with the notch groove 9 so that the rotary shaft 1 is plastic. A hiss plate 5 is provided on the inner peripheral surface of a cylindrical casing 4 which supports the magnet 3a and is rotatably supported on the rotating shaft 1.
Attached to the bearing portion 6a of one side plate 6 of the casing 4,
In the torque limiter in which the guide groove 7 that allows passage of the engaging projection 8 provided on the rotary shaft 1 is formed, the outer opening 7a and the inner opening 7b of the guide groove 7 are made to have a phase equal to or more than the width of the guide groove 7. A torque limiter for paper feeding devices for office equipment and the like. 3. A rotating plate 1 is provided with an engaging projection 8 and a His plate supporting cylinder 2a is formed with a notch groove 9. By engaging the engaging projection 8 with the notch groove 9, the rotating plate 1 is provided with a His plate. A magnetic material is attached to the inner peripheral surface of a cylindrical casing 4 that supports the support cylinder 2a, and has a cylindrical his plate 5a attached to the outer peripheral surface of the his plate support cylinder 2a and rotatably supported with respect to the rotating shaft 1. In the torque limiter in which 3a is attached and a guide groove 7 is formed in the bearing portion 6a of one side plate 6 of the casing 4 to allow passage of the engaging projection 8 provided on the rotary shaft 1, the outside of the guide groove 7 Opening 7a and inner opening 7b
A torque limiter for a paper feeding device for office equipment or the like, characterized in that and are phased to be wider than the width of the guide groove 7. 4. A paper feeding device for office equipment or the like according to any one of claims 1 to 3, characterized in that the outer opening 7a and the inner opening 7b of the guide groove 7 communicate with each other in a spiral shape. Torque limiter for. 5. A paper feed for office equipment or the like according to claims 1 to 3, characterized in that the outer opening 7a and the inner opening 7b of the guide groove 7 communicate with each other in a crank shape. Torque limiter for equipment. 6. The width of the engaging projection 8 is slightly wider than the width of the engaging projection 8 between the inner opening 7b of the guide groove 7 and the cutout groove 9 formed in the magnetic body supporting cylinder 2 or the plastic magnet 3a or the hysteresis plate supporting cylinder 2a. A torque limiter for a paper feeding device for office equipment and the like according to claims 1 to 5, characterized in that the clearance 10 is held.