JPS63298263A - Liquid developing pump - Google Patents

Abstract

PURPOSE:To enlarge the degree of freedom of a layout by transferring selectively rotational force of a single motor to plural passive rotary member, and allowing a liquid developer to flow to a developing head by operating a pump head assembly. CONSTITUTION:The titled pump is provided with a single motor 50, selective rotation transfer means 60, 61-64, 65 and 68 for transferring selectively rotational force of the single motor 50 to plural passive rotary members 66, and pump head assemblies 51-54 which are connected to each passive rotary member 66 to which rotational force is transferred by the selective rotation transfer means 60, 61-64, 65 and 68 and allow a liquid developer to flow to a developing head. That is, the rotation of the motor is transferred selectively to plural passive rotary members, and only a necessary pump head assembly connected to its passive rotary member is operated selectively, therefore, as for the motor, a single one will suffice and also the degree of freedom of a layout in a device to be applied also becomes large.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention involves applying a liquid developer using a developing head to an electrostatic latent image formed on an electrostatic recording medium to form a first color to an nth color. The present invention relates to a liquid developing pump that is applied to an apparatus that forms a multicolor image by repeating a color image recording process a plurality of times.

[Conventional technology]

Conventional multicolor image forming devices of this type include, for example, an electrostatic color plotter as disclosed in Japanese Patent Application Laid-open No. 60-263969, and a zinc oxide paper instead of electrostatic recording paper in the electrostatic color block. Alternatively, a photosensitive paper-type electrophotographic color copier/printer that uses photosensitive paper such as titanium oxide paper and performs uniform charging and image exposure to form a latent image, or a photosensitive paper-type electrophotographic color copier/printer that uses a three-color developing head to produce a single color PPC type color copying machines, printers, etc., which repeat development and transfer one by one are known. All of these devices are equipped with three to four color developing heads, and are designed to sequentially develop one color at a time.

The developing head is a suction type or a roller type.

There are continuous flow types, etc., but they can be categorized based on the type that circulates and supplies the developer: a negative pressure suction type that uses negative pressure, and a type that supplies liquid developer pumped up by a pump.

Vane pumps, which have a strong suction force and can perform suction without priming, are widely used as liquid developing pumps.

FIG. 6 is a diagram showing a schematic configuration of an electrostatic color plotter disclosed in Japanese Patent Application Laid-Open No. 60-263969. 1 in the figure is a recording paper supply roll, and the belt-shaped recording paper 10 wound around this recording paper supply roll 1 is transported to the feed roller 2.
a, 3a and 2b.

3b, it is transported in the direction of arrow A. The above recording paper 10
When the electrostatic recording head 4 passes between the electrostatic recording head 4 and the pressure roller 5, an electrostatic latent image is formed by the electrostatic recording head 4. Drying heads 6a and 6b suck and remove the liquid adhering to the recording paper by operating the pump 7, thereby drying the recording paper. 8
is a container that contains the waste liquid. The electrostatic latent image formed on the recording paper 10 is developed by the developing head assembly 9. The developing head assembly 9 includes a plurality of, for example, four developing heads 11 to 14 for each color, and these heads 11 to 14 selectively move upward in each color development process, thereby sequentially developing each color. It is supposed to be carried out. Note that the developing process for each color is repeatedly executed by moving the recording paper 10 back and forth a plurality of times. Each of the developing heads 11 to 14 has pumps 21 to 2, respectively.
4 are connected to each other, and each head 11 to 14 sucks up the liquid developer of each color in the developer containers 31 to 34.
It is intended to be supplied to

FIGS. 7(a) and 7(b) are a longitudinal sectional front view and a partially cutaway side view showing the configuration of the vane pump. 40 in the figure is a motor;
41 is a pump seat, 42 is a casing, 63 is a lid, 44 is a motor shaft, 45 is a rotor, 46 is a slide groove, 47 is a slider, and 48a.

Reference numeral 48b denotes a cap for leading in and out of the developer.

As shown in FIGS. 7(a) and 7(b), the pump seat 41 and the casing 42. The lid 43 allows the pump chamber to connect to the motor shaft 44.
It is made eccentric to the The rotor 45 is coaxial with the motor shaft 44, and a slider 47 is slidably fitted into a slide groove 46 provided along the radial direction on the outer circumference of the rotor 45. Thus, as the rotor 45 rotates, the slider 47 and the rotor 45
The volume inside the pump chamber surrounded by the casing 42 changes. For example, when the rotor 45 rotates clockwise in FIG. 6A, the internal volume of the pump chamber communicating with the mouthpiece 68a constantly increases, and liquid developer is sucked from the tube connected to the mouthpiece 68a. Further, the volume of the pump chamber communicating with the mouthpiece 68b is constantly reduced, and the liquid developer taken into the pump chamber is sent out to the tube connected to the mouthpiece 68b.

[Problem that the invention seeks to solve]

When the vane pumps shown in FIGS. 7(a) and 7(b) are applied as the liquid developing pumps 21 to 24 of the apparatus shown in FIG. 6, a plurality of vane pumps must of course be provided. For this reason, there are problems in that the degree of freedom in layout within the device is reduced, the overall size of the device is increased, and the manufacturing cost is also high.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid developing pump that has a high degree of freedom in layout within an apparatus to which it is applied, can be miniaturized, and is low in cost.

[Means for solving problems]

In order to solve the above-mentioned problems and achieve the object, the present invention takes the following measures. That is, the rotational force of a single motor is selectively transmitted to a plurality of passive rotating members by means of selective rotation transmission means such as a pulley, a belt, an electromagnetic clutch, etc., and the pump head is connected to each passive rotating member. The assembly was selectively activated to cause liquid developer to flow to the development head.

[Effect]

By taking such measures, the following effects are achieved. That is, the rotation of the motor is selectively transmitted to the plurality of passive rotating members, and only the required pump head assembly connected to the passive rotating members is selectively operated. Therefore, a single motor is sufficient, and if only one pump is always driven,
The motor power only needs to be commensurate with this, and the device is generally small, can be manufactured at low cost, and has a large degree of freedom in layout within the device to which it is applied.

〔Example〕

FIGS. 1(a) and 1(b) are a front view and a side view showing a first embodiment of the present invention. In the figure, 50 is a single motor,
51 to 54 are first to fourth clutch pumps. A pulley 60 is attached to the rotating shaft 50a of the motor 50, and a pulley 60 is attached to the first to fourth clutch pumps 51 to 54.
1 to 64 are installed respectively. motor pulley 60
A belt 65 is placed between the pump pulleys 61 to 64 and the pump pulleys 61 to 64. Each clutch pump 51 to 54 includes a pump head 66, a housing 67, and an electromagnetic clutch 68.

When the motor 50 is continuously rotated in this manner, the motor pulley 60 attached to the motor 50 rotates, and this rotation is transmitted to each of the pump pulleys 61 to 64 via the belt 65. Therefore, one of the clutch pumps that you want to operate, for example 5
When the first electromagnetic clutch 68 is turned on, the rotation of the pulley 61 of the same clutch pump 51 is transmitted to the pump head 66 of the same clutch pump 51. As a result, only the pump head 66 of the clutch pump 51 with the electromagnetic clutch 68 turned on rotates.

FIG. 2 is a sectional view of one clutch pump 51. However, since the configuration of the pump head 66 is exactly the same as that shown in FIGS. 7(a) and 7(b), only the outline is shown and the specific structure is not shown. In the figure, 71
, 72 and 73 are bearings, 74 is a rotating shaft, 75 is a rotor, 76 is a holder, 77 is an actuator, and 78 is an electromagnetic coil.

As shown in the figure, bearings 71 are provided at both ends of the housing 67.
．． 72 is installed 1 and rotatably supports a rotating shaft 74. A pump head 66 and a rotor 75 are fixed to this rotating shaft 74. Pulley 61. Holder 7
6. The actuator 77, via the bearing 73,
Rotating shaft 741; is coupled in a free state to the rotating shaft 741;

Further, an electromagnetic coil 28 is provided adjacent to one side of the rotor 75 in order to magnetize the rotor 75 at an appropriate time.

The actuator 77 is connected to the holder 76 through a slide groove so as to be slidable along its axis, and is applied with a displacing force by a spring.

Therefore, if current is applied to the electromagnetic coil 78, the rotor 75
is magnetized and the actuator 77 is attracted and coupled. Since this actuator 77 is connected to the pulley 61 via the holder 76, the rotation of the pulley 61 is transmitted to the rotating shaft 74, and the pump head 66 is operated.

If the power to the electromagnetic coil 78 is cut off, the actuator 77
The connection between the pulley 61 and the rotary shaft 75 is released, and the pulley 61 and the rotating shaft 75 are separated and become free.

In this embodiment with the above configuration, the vibration of the rotation axis required for the pump head 66, the concentric precision for a part of the spigot,
The perpendicularity of the shaft and thrust play can be easily set to the required conditions.

FIGS. 3(a) and 3(b) are diagrams showing the configuration of a second embodiment of the present invention in correspondence with FIGS. 1(a) and (b). This embodiment differs from the first embodiment in the following points. The first point is that the motor 50 is connected to the first to fourth clutch pumps 51 to 5.
4, for example, in a coaxial position opposite to 54 as shown in the figure, and the rotating shaft 50a of the motor 50 and the shaft of the pulley 64 of the clutch pump 54 are connected to the free joint 6.
9, and the pulleys 61 to 63 of the other clutch pumps 51 to 53 and the pulley 64 of the clutch pump 54 facing the motor 50 are connected by a belt 65. The second feature is that one clutch pump, for example 53, is movable in the direction shown by the arrow in FIG. 3(a), thereby making it possible to adjust the belt tension.

According to the present embodiment configured in this way, the winding angle of the belt 65 is larger than that of the first embodiment, so that rotation can be transmitted reliably. Another advantage is that the height of the assembly can be reduced.

FIG. 4 is a diagram showing the configuration of a third embodiment of the present invention in correspondence with FIG. 1(a). This embodiment differs from the first embodiment in that the motor 50 is arranged parallel to the side of one clutch pump, for example 51, and the pulley of the clutch pump 51 is a two-stage pulley 61', and the first stage pulley is The pump pulleys 62 to 64 are connected to the motor pulley 60 by a belt 80, and the second stage booby part is connected to each of the pump pulleys 62 to 64 by a belt 65.

According to the present embodiment configured in this manner, the pulley wrapping angle of the belt 65 can be increased as in the second embodiment, and the length in the axial direction can be made the same length as in the first embodiment. , the whole can be made more compact.

FIG. 5 is a diagram showing the configuration of a fourth embodiment of the present invention in correspondence with FIG. 2. This embodiment differs from the first embodiment in that the rotor 75 is connected to the rotary shaft 74 by a keyway mechanism 8.
1, the rotor 75 can be slid in the axial direction, and a contact member 82 made of a magnet is attached to the surface of the rotor 75 facing the holder. , is arranged so as to face a holder 83 made of a magnetic material with a gap G in between.

When the electromagnetic coil 78 is excited, the rotor 75 is attracted, and the contact member 82 attached to the rotor 75 is separated from the holder 83 by the gap G, and the connection is released. Further, when the excitation of the electromagnetic coil 78 is cut off, the contact member 82 made of a magnet is attracted to the holder 83, and the contact member 82 is brought into a bonded state by frictional contact. As a result, rotational force is transmitted.

According to this embodiment, since a completely disconnected state is exhibited across the gap G when uncoupled, there is an advantage that no wasteful energy loss occurs.

Note that the present invention is not limited to the above embodiments.

For example, in the embodiment described above, an electromagnetic clutch is provided between the pump pulleys 61 to 64 of each clutch pump 51 to 54 and the pump head 66 as the clutch of the selective rotation transmission means. A plurality of clutch boots may be provided on an integrally provided shaft to correspond to each of the clutch pumps 51 to 54, respectively, and the connection/disconnection may be performed using these clutch boots.

Furthermore, in the embodiment described above, the belt-shaped belt 65 is used as a means for transmitting the rotational force to each pulley, but gear transmission, timing belt transmission, chain transmission, etc. may also be used. Furthermore, in the above embodiment, the case where one of the plurality of clutch pumps is selected and operated is illustrated,
Two or more selected clutch pumps may be operated simultaneously. For example, the clutch pump for the drying head may be operated at all times.

It goes without saying that various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, the rotational force of a single motor is selectively transmitted to a plurality of passive rotating members by means of selective rotation transmission means consisting of, for example, a pulley, a belt, an electromagnetic clutch, etc., and the rotational force is connected to each passive rotating member. Since the pump head assembly is selectively operated to flow the liquid developer to the developing head, there is a large degree of freedom in the layout within the applicable device, and maintenance is high and the device space can be used effectively. Moreover, it is possible to provide a liquid developing pump that can be made smaller in size and manufactured at low cost.

[Brief explanation of drawings]

Figures 1 (a) and (b) are front and side views showing the configuration of a first embodiment of the present invention, Figure 2 is a sectional view of the clutch pump of the same embodiment, and Figures 3 (a) and (b). 4 is a front view and a side view showing the configuration of the second embodiment of the present invention, FIG. 4 is a diagram showing the configuration of the main part of the third embodiment of the present invention, and FIG. FIG. 3 is a diagram showing the configuration of main parts. FIG. 6 and FIGS. 7(a) and 7(b) are explanatory diagrams of the prior art. 50...Motor, 51-54...Clutch pump,
60...Motor pulley, 61-64...Pump pulley, 65...Belt, 66...Pump head, 67
...Housing, 68...Electromagnetic clutch, 69...
・Free join, 71.72.73...bearing, 74...rotating shaft, 75...rotor, 76...
Holder, 77... Actuator, 78... Electromagnetic coil, 81... Keyway mechanism, 82... Contact member,
83...Holder. Applicant's agent Patent attorney Atsushi Tsuboi (a) No. 1 (b) Amendment to figure procedure Showa 6-7. f 13th, Commissioner of the Patent Office Ogawa JIS Daidono 1, Indication of Case Patent Application 1986-133174 @ (037) 7f Rimbus Optical T Gyo Co., Ltd. 4, Agent 3-7 Kasumigaseki, Chiyoda-ku, Tokyo, February 1jBE Building 〒100 Telephone: 03 (502) 3181 (main representative)
6. Subject of correction is the full text 7.? di positive content

Claims (2)

[Claims] (1) A liquid developer is applied to the electrostatic latent image formed on the electrostatic recording medium by a developing head, and the process of recording color images of the first to nth colors is repeated multiple times;
A liquid developing pump applied to an apparatus for forming a multicolor image includes a single motor, selective rotation transmission means for selectively transmitting the rotational force of the single motor to a plurality of passive rotation members, and A pump for liquid development, comprising: a pump head assembly connected to each passive rotation member to which rotational force is transmitted by a selective rotation transmission means, and for causing liquid developer to flow through a development head. (2) The liquid developing pump according to claim 1, wherein the selective rotation transmission means includes an electromagnetic clutch interposed between the motor and the passive rotating member.