JPH0571463U - Electromagnetic clutch - Google Patents

Abstract

(57) [Summary] [Purpose] For example, to speed up the delivery time of electromagnetic clutches used for paper feeding of copiers, especially for sample delivery, and at the same time to reduce costs. [Construction] A hub having an integral structure is used as a hub assembly 16 composed of a plastic molded hub body 17 and transmission parts such as gears 18, pulleys, or sprockets, and the transmission parts are connected to the hub body 17 by a snap fit method. .. In this case, the snap-fit type coupling is one or a plurality of pawls 17g provided on one outer peripheral portion of the cylindrical portion 17c of the hub body and the same number of pawls 17g on the transmission component side such as the gear 18. This may be performed by forming the recess 18b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an electromagnetic clutch used, for example, for feeding a copying machine.

[0002]

[Prior Art]

 A conventional electromagnetic clutch used for paper feeding of a copying machine has a structure as shown in FIG. In the figure, reference numeral 1 denotes a stator, which is a yoke having a coil 2 built therein, which is non-rotatably locked to a fixing member (not shown), and 3 has a lining (not shown) fixed thereto. , Which is the main connecting body of the above, is mounted on the rotating shaft 4 so as not to rotate relative to it. A rotor retainer 5 is attached to the rotary shaft 4 so as to press the rotor 3 against the hub 6. 4 is, for example, a rotary shaft made of a non-magnetic material and a low friction resistance material, and the end on the rotor pressing 5 side is divided into three parts in the circumferential direction into three legs 7 (see FIG. 2). Engaged. Further, the hub 6 holds an armature 8 which is the other main connecting body on the rotor 3 side so as to be slidable in the axial direction together with a leaf spring 9 for returning the same, and on the side opposite to the rotor 3 is an external member. It has a gear 10 for coupling with a driving body and is rotatably attached to a rotary shaft 4.

Explaining the operation of this electromagnetic clutch, in the state where the input (output when the transmission direction is opposite) is transmitted to the gear 10 of the hub 6 to rotate the hub 6 and the rotating shaft 4 is stationary, When the coil 2 is energized, the magnetic flux φ pulls the armature 8 to the left in FIG. 8 against the spring force of the leaf spring 9, and the lining (not shown) fixed to the rotor 3 and the armature 8 are pulled. The gap g with the armature 8 becomes zero, and the rotation of the hub 6 is caused by the torque through the protrusion 11 (see FIG. 8 and FIG. 9 of the front view of the hub 6) of the hub which is in the trisecting angular position near the outer circumference. Is transmitted in the order of armature 8 → rotor 3 → rotary shaft 4 → driven shaft 12.

[0004]

[Problems to be solved by the device]

 By the way, the hub 6 in the conventional electromagnetic clutch receives the drive torque input from the drive unit from the gear 10, but there are various customer demands such as the outer diameter and width of the gear, and further various types. It has a great variety of pulleys, sprockets, etc., and the rotor side has a protrusion 11 for engaging with the armature and a recess 12 for engaging with a plate as shown in FIGS. However, especially when delivering samples, there was the problem that the delivery time could not be shortened due to complicated machining and the processing cost could not be reduced. It is an object of the present invention to provide an electromagnetic clutch that solves the above-mentioned problems (problems) of conventional ones.

[0005]

[Means for Solving the Problems]

 In the present invention, the integral hub is a hub assembly consisting of a plastic molded hub body and transmission parts such as gears, pulleys, or sprockets, and the above-mentioned transmission parts are connected to the hub body by a snap fit method. The problem is to solve the problem. In this case, the snap-fit type coupling can be performed by forming a claw 17g on one outer peripheral portion of the cylindrical portion 17c of the hub body and a recess 18b on the gear 18 side that engages with the claw 17g. .. In this case, a plurality of the claws 17g should be formed on the outer circumference of the cylindrical portion 17c of the hub body at appropriate intervals, while the recesses 18b of the transmission component should be provided in the same number at the corresponding positions of the claws 17g. Is desirable.

[0006]

[Action]

 In the electromagnetic clutch according to the present invention, since the outline dimensions of the hub assembly are the same as those of the conventional hub, there is no need to change anything except the hub assembly.Since the hub body is a plastic molded product and is common regardless of the customer's transmission system, a large amount is prepared in advance. It can be easily assembled by a snap-fit method using the elasticity of the pawls provided on the engagement part with the rotating shaft of the hub body by preparing only the transmission parts according to the customer's desired transmission method. ..

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS. In each drawing, the same components as those of the conventional one are denoted by the same reference numerals as those in FIGS. 8 and 9. Reference numeral 16 is a hub assembly, which is composed of a hub body 17 and a gear 18 of a transmission component, and has the same outline dimensions as the conventional hub 6 (see FIG. 8). The hub body 17 is manufactured as a plastic molded product, As shown in FIGS. 3 to 5 (b), a rectangular protrusion 17b is provided near the outer circumference of one side of the disk-shaped flange portion 17a at three angular positions, and the notch 8a of the armature 8 ( 1), and a hollow 17d near the inner periphery of which a leaf spring 9 (see FIG. 1) is fitted is provided in the cylindrical portion 17c at an intermediate angular position of the protrusion 17b as shown in FIG. On the other hand, a deformed quadrangular recess 17e (see FIGS. 3 and 5 (a)) is formed at the trisection angle position near the inner circumference of the other side surface. Reference numeral 17g denotes three claws formed on the outer periphery of the cylindrical portion 17c of the hub body 17 at three equally angular positions, and 17f denotes a slit provided at the end of the cylindrical portion 17c (Figs. 3, 5). (See (a) and (b)). In addition, a slanting protrusion 17h and a vertical portion 17i are formed on the outer peripheral portion of the tip of the claw 17g. On the other hand, as shown in FIGS. 6 and 7, the gear 18 having an inner diameter that engages with the outer diameter of the cylindrical portion 17c of the hub body 17 has a recess 17e (FIG. 1, FIG. And a deformed quadrangular protrusion 18a (see FIG. 5 (a)) and a vertical portion 17i (see FIGS. 3 and 5 (b)) of the slanted protrusion 17h of the hub body 17 engages with the other side surface. The hollow 18b is formed.

In the above structure, as shown in FIG. 1, when the gear 18 is pushed from the right side of the hub body 17, each elastic claw 17g bends once in the direction of the central axis, and the pushing of the gear 18 is completed. Then, it returns to the original position and snap-fit connection is performed with one touch. In the above embodiment, three claws 17g are provided on the outer periphery of the cylindrical portion 17c of the hub body 17 at three equally divided positions, and correspondingly, three recesses 18b are provided on the gear 18 side as well. As described above, the number of the claws 17g may be one or two, and the gears 18 may be provided with the same number of recesses 18b corresponding to the claws 17g. Further, the gear 18 can be replaced at any time with a gear having a different outer diameter, a tooth width, or the like, or a pulley, a sprocket, or the like, depending on the relationship with the application model on the drive side.

[0009]

[Effect of the device]

 As described above, in the present invention, in addition to the standard type electromagnetic clutch body, a large amount of the hub body of the present invention is prepared by plastic molding, and the transmission part is processed according to the customer's request to form a hub assembly. Since it is sufficient to manufacture a solid, it has the following excellent effects. The electromagnetic clutch according to the present invention is particularly suitable for sample delivery. In addition, according to the present invention, an electromagnetic clutch that can be easily incorporated into a customer's applicable model can be quickly manufactured, so that the cost of this type of electromagnetic clutch can be reduced and sales can be promoted.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an electromagnetic clutch according to an embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a vertical sectional front view of a hub body according to the present invention.

FIG. 4 is a left side view of FIG.

5 (a) is a right side view of FIG. 3, and FIG. 5 (b) is a partial view taken along the arrow A of FIG. 5 (a).

FIG. 6 is a vertical sectional front view of a gear according to the present invention.

FIG. 7 is a left side view of FIG.

FIG. 8 is a vertical sectional front view of a conventional electromagnetic clutch.

9 is a left side view of the hub shown in FIG.

[Explanation of symbols]

 16: Hub assembly 17: Hub body 17g: Claw 18: Gear 18b: Recess

Claims (3)

[Scope of utility model registration request] 1. A rotary shaft, a rotor fixed to the rotary shaft so as not to rotate relative to the rotary shaft, a hub assembly fixed to the rotary shaft so as to be rotatable and slidable, and a rotary shaft attached to the hub assembly. An armature capable of being connected to the rotor,
A rotor retainer that is non-rotatably attached to the rotating shaft so as to press the rotor against the hub assembly side,
In the electromagnetic clutch provided with a stator slidably mounted on the rotor retainer and an exciting coil installed in the stator and controlling the connection between the rotor and the armature, the hub is provided. The electromagnetic clutch is characterized in that the assembly comprises a plastic molded hub body and transmission parts such as gears, pulleys or sprockets, and the transmission parts are coupled to the hub body by a snap fit method. 2. The snap-fit type coupling is such that a claw 17g is formed on one outer peripheral portion of the cylindrical portion 17c of the hub body, and a recess 18 is formed on the side of a transmission component such as a gear 18 which engages with the claw 17g.
The electromagnetic clutch according to claim 1, wherein the electromagnetic clutch is formed by forming b. 3. The claw 17g is a cylindrical portion 17c of the hub body.
3. The electromagnetic clutch according to claim 2, wherein a plurality of recesses 18b of the transmission component are provided at the corresponding positions of the pawls 17g on the outer periphery of the claw 17g at appropriate intervals.