JP2732461B2 - Liquid development pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, a method of causing a developing head to apply a liquid developer to an electrostatic latent image formed on an electrostatic recording medium, thereby forming a first color to a first color. The present invention relates to a liquid developing pump applied to an apparatus for forming a multicolor image by repeatedly performing a recording process of an n-color image a plurality of times. [Prior Art] As a conventional multicolor image forming apparatus, for example,
An electrostatic color plotter as shown in 263969,
A photosensitive paper type electrophotograph in which a photosensitive paper such as a zinc oxide paper or a titanium oxide paper is used instead of the electrostatic recording paper in the electrostatic color plotter and a uniform image is formed by performing uniform charging and image exposure. 2. Description of the Related Art A color copier / printer, a PPC type color copier / printer that repeats development and transfer for each color using a three-color developing head are known. Each of these apparatuses has a developing head for three to four colors, and develops one color at a time. The developing head includes a suction type, a roller type, a flowing type, and the like. When classified according to a method of supplying and circulating the developer, a negative pressure suction type using a negative pressure and a liquid developer pumped up by a pump are used. There is a supply type. Further, as a liquid developing pump, a vane pump having a strong suction force and capable of sucking without priming is widely used. FIG. 6 is a view showing a schematic configuration of an electrostatic color plotter disclosed in Japanese Patent Application Laid-Open No. 60-263969. In the figure, reference numeral 1 denotes a recording paper supply roll. A belt-like recording paper 10 wound around the recording paper supply roll 1 is transported by feed rollers 2a, 3a and 2b, 3b as shown by an arrow A. Recording paper 1 above
When 0 passes between the electrostatic recording head 4 and the pressing roller 5, an electrostatic latent image is formed by the electrostatic recording head 4. Reference numerals 6a and 6b denote drying heads, which operate by the operation of the pump 7 to remove the liquid adhering to the recording paper by suction and dry the recording paper. 8
Is a container for storing 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 are selectively moved upward for each color developing process, thereby sequentially developing each color. Is to be performed. Each color developing step is repeatedly executed by reciprocating the recording paper 10 a plurality of times. Each of the above developing heads
Pumps 21 to 24 are connected to 11 to 14, respectively.
The liquid developers of the respective colors in the developer containers 31 to 34 are sucked up and supplied to the heads 11 to 14, respectively. FIGS. 7 (a) and 7 (b) are a vertical sectional front view and a partially cut-away side view showing the structure of the vane pump. In the figure, 40 is a motor,
41 is a pump seat, 42 is a casing, 43 is a lid, 44 is a motor shaft, 45 is a rotor, 46 is a slide groove, 47 is a slider, 48a, 48
“b” is a mouthpiece for taking in and out the developer. As shown in FIGS. 7A and 7B, the pump chamber is formed eccentrically with respect to the motor shaft 44 by the pump seat 41, the casing 42, and the lid 43. Rotor 45 is motor shaft
A slider 47 is slidably fitted in a slide groove 46 provided radially on the outer periphery of the rotor 45 so as to be coaxial with the rotor 45. Thus, as the rotor 45 rotates, the volume of the pump chamber surrounded by the slider 47 and the rotor 45 and the casing 42 changes. For example, when the rotor 45 rotates clockwise in FIG. 5A, the volume of the pump chamber communicating with the base 48a always increases, and the liquid developer is sucked from the tube connected to the base 48a. Also base
The volume of the pump chamber communicating with 68b is constantly reduced, and the liquid developer taken into the pump chamber is sent out to a tube connected to the base 68b. [Problems to be Solved by the Invention] When the vane pumps shown in FIGS. 7A and 7B are applied as the liquid developing pumps 21 to 24 of the apparatus shown in FIG. Must be equipped with a vane pump. Therefore, there is a problem that the degree of freedom in the layout in the device is reduced, and that the entire device is enlarged and the manufacturing cost is increased. Therefore, an object of the present invention is to provide a liquid developing pump that drives one of a plurality of pumps with a single motor. [Means for Solving the Problems] In order to solve the above problems and achieve the object, the liquid developing pump of the present invention is configured as follows. Apparatus for forming a multicolor image by repeating a recording process of a first to nth color image a plurality of times by applying a liquid developer by a developing head to an electrostatic latent image formed on a recording medium A single motor, a passive rotating member that rotates by transmitting the rotational force of the motor, a pump head that sends out liquid developer by rotating a rotor, and the passive rotating member. A plurality of clutch pumps each having a clutch for intermittently transmitting and receiving rotational force to the rotor, and the rotational force of the motor is changed to the passive rotational speed in order to simultaneously rotate the respective passive rotating members of the plurality of clutch pumps at the same rotational speed. A torque transmitting means for transmitting the torque to a member, and by selecting any one of the plurality of clutch pumps and turning on the clutch, Switch pumps are selectively operated with the same driving force. The passive rotating members of the plurality of clutch pumps include:
It is preferable that the rotation axes are arranged in parallel on the same plane. [Operation] The following operation is exhibited by taking such means. That is, the rotation of the motor is selectively transmitted to the plurality of passive rotary members, and only the required pump head assembly connected to the passive rotary members selectively operates. Therefore, a single motor may be used, and when only one pump is driven at all times, the motor power may be suitable for that.
As a whole, it is small, can be manufactured at low cost, and has a high degree of freedom in layout within the applied device. Embodiment FIGS. 1A and 1B are a front view and a side view showing a first embodiment of the present invention. 50 in the figure is a single motor,
51 to 54 are first to fourth clutch pumps. Motor 50
A pulley 60 is mounted on the rotary shaft 50a, and pulleys 61 to 64 are mounted on the first to fourth clutch pumps 51 to 54, respectively. Motor pulley 60 and pump pulleys 61-64
A belt 65 is hung between each other. Each of the clutch pumps 51 to 54 includes a pump head 66, a housing 67, and an electromagnetic clutch 68. Thus, when the motor 50 is continuously rotated, the motor pulley 60 attached to the motor 50 rotates, and this rotation is
Are transmitted to each of the pump pulleys 61 to 64 via the pulleys 61 to 64.
64 rotate at the same rotation speed. Then, when the electromagnetic clutch 68 of one of the clutch pumps to be operated, for example, 51 is turned on, the rotation of the pulley 61 of the clutch pump 51 is transmitted to the pump head 66 of the clutch pump 51. As a result, only the pump head 66 of the clutch pump 51 that has turned on the electromagnetic clutch 68 rotates. If you want to operate other clutch pumps 52 to 54, turn on the electromagnetic clutch of the same clutch pump,
As in the case of the clutch pump 51, the pump head of the clutch pump rotates with the same driving force. FIG. 2 is a sectional view of one clutch pump 51, and the other clutch pumps 52, 53, 54 have the same configuration. However,
Since the configuration of the pump head 66 is exactly the same as that shown in FIGS. 7A and 7B, 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, bearings 71, 7 are provided at both ends of the housing 67.
2 are installed and rotatably support the rotating shaft 74. A pump head 66 and a rotor 75 are fixed to the rotating shaft 74. Pulley 61, holder 76, actuator 77
Are connected to the rotating shaft 74 in a free state via a bearing 73. An electromagnetic coil 28 is provided adjacent to one side surface of the rotor 75 to magnetize the rotor 75 as needed. The actuator 77 is connected to the holder 76 by a slide groove so as to be slidable along the axis, and is provided with a displacement force by a spring. Therefore, when a current is applied to the electromagnetic coil 78, the rotor 75 is magnetized and the actuator 77 is attracted and coupled.
Since the actuator 77 is coupled to the pulley 61 via the holder 76, the rotation of the pulley 61 is transmitted to the rotation shaft 74, and the pump head 66 operates. When the energization of the electromagnetic coil 78 is stopped, the coupling by the actuator 77 is released, and the pulley 61 and the rotating shaft 75 are separated to be in a free state. In the present embodiment having the above configuration, the rotation of the rotary shaft required for the pump head 66, the concentric accuracy with respect to the spigot portion,
The perpendicularity of the shaft and the thrust play can be easily set to the required state. 3 (a) and 3 (b) show the configuration of a second embodiment of the present invention.
FIG. 2 is a diagram corresponding to FIGS. 1 (a) and 1 (b). This embodiment is different from the first embodiment in the following points. The first
The point is that the motor 50 is disposed at a coaxial position facing one of the first to fourth clutch pumps 51 to 54, for example, as shown in the drawing, and the rotating shaft 50a of the motor 50 and the pulley of the clutch pump 54 are The shaft 64 is connected by a free joint 69, and the pulleys 61-63 of the other clutch pumps 51-53 and the pulley 64 of the clutch pump 54 facing the motor 50 are connected by a belt 65. is there. The second is that one clutch pump, for example, 53 can be moved in the direction indicated by the arrow in FIG. 3 (a) to adjust the belt tension. According to the present embodiment configured as described above, the winding angle of the belt 65 is larger than that of the first embodiment, so that the transmission of rotation is ensured. Also, there is an advantage that the height of the assembly can be reduced. FIG. 4 is a diagram showing the configuration of the third embodiment of the present invention in correspondence with FIG. 1 (a). This embodiment is different from the first embodiment in that the motor 50 is connected to a single clutch pump, for example.
The pulley of the clutch pump 51 is a two-stage pulley 61 ′, the first stage pulley is connected to the motor pulley 60 and a belt 80, and the second stage pulley is connected to each of the pump pulleys 62 to 51. This is the point where the belt 64 and the belt 65 are connected. According to the present embodiment configured as described above, similarly to the second embodiment, the pulley wrapping angle of the belt 65 can be increased, and the axial length can be set to the same length as the first embodiment. , The whole can be made compact. FIG. 5 is a diagram showing the configuration of the fourth embodiment of the present invention in correspondence with FIG. This embodiment is different from the first embodiment in that the rotor 75 is slidable in the axial direction by connecting the rotor 75 to the rotating shaft 74 via a keyway mechanism 81, and the rotor 75 The contact member 82 made of a magnet is attached to the holder-facing surface, and the contact member 82 is arranged so as to face the magnetic material holder 83 across the gap G when the electromagnetic coil 78 is excited. Thus, when excitation is performed by the electromagnetic coil 78, the rotor
The contact member 82 attached to the rotor 75 by the suction of the member 75 is separated from the holder 83 by the gap G to release the connection. When the excitation of the electromagnetic coil 78 is cut off, the holder
The contact member 82 made of a magnet is attracted to the 83 and is brought into a connected state by frictional contact. As a result, transmission of rotational force is performed. According to the present embodiment, when disconnected, a completely separated state is provided across the gap G, so that there is an advantage that unnecessary energy loss does not occur. The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the electromagnetic clutch is provided between the pump pulleys 61 to 64 and the pump head 66 in each of the clutch pumps 51 to 54 as the clutch of the selective rotation transmitting means has been exemplified. A plurality of clutch pulleys may be provided on the integrally provided shaft corresponding to the clutch pumps 51 to 54, respectively, and these clutch pulleys may be intermittently connected. In the above-described embodiment, the belt-shaped belt 65 is used as the means for transmitting the rotational force to each pulley. However, gear transmission, timing belt transmission, chain transmission, and the like may be used. For example, the clutch pump for the drying head may be always operated. In addition, it goes without saying that various modifications can be made without departing from the spirit of the present invention. [Effects of the Invention] According to the present invention, any one of a plurality of clutch pumps can be selected and operated, and even when any clutch pump is selected, it always operates with the same driving force. It is possible to provide a liquid development pump capable of causing the liquid development to be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) are a front view and a side view showing a configuration of a first embodiment of the present invention, FIG. 2 is a sectional view of a clutch pump of the embodiment, and FIG. 4A and 4B are a front view and a side view showing a configuration of a second embodiment of the present invention, FIG. 4 is a diagram showing a configuration of a main part of a third embodiment of the present invention, and FIG. It is a figure showing composition of the principal part of a 4th example of the invention. 6 and 7 (a) and 7 (b) are explanatory diagrams of the prior art. 50: Motor, 51 to 54: Clutch pump, 60: Motor pulley, 61 to 64: Pump pulley, 65: Belt, 66
…… Pump head, 67 …… Housing, 68 …… Electromagnetic clutch, 69 …… Free joint, 71,72,73 …… Bearing, 74 …… Rotating shaft, 75 …… Rotor, 76 …… Holder, 77
…… actuator, 78 …… electromagnetic coil, 81 …… key groove mechanism, 82 …… contact member, 83 …… holder.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Masaharu Nishikawa               2-43-2 Hatagaya, Shibuya-ku, Tokyo               Linpass Optical Co., Ltd.                    Panel     Referee Mikio Kinoshita     Judge Katsuyoshi Ima     Referee Osamu Komaki                (56) References JP-A-59-63393 (JP, A)                 JP-A-58-178897 (JP, A)                 JP-A-58-144687 (JP, A)                 JP-A-60-263969 (JP, A)                 JP-A-63-159876 (JP, A)                 48-70642 (JP, U)

Claims (1)

(57) [Claims] Apparatus for forming a multicolor image by repeating a recording process of a first to nth color image a plurality of times by applying a liquid developer by a developing head to an electrostatic latent image formed on a recording medium A single motor, a passive rotating member that is rotated by transmitting the rotational force of the motor, a pump head that sends out the liquid developer by rotating a rotor, and the passive rotating member. A plurality of clutch pumps having clutches for intermittently transmitting torque to the rotor; and the passive force rotating the motor to rotate the respective passive rotating members of the plurality of clutch pumps simultaneously at the same rotation speed. A torque transmitting means for transmitting the torque to the clutch, and selecting any one of the plurality of clutch pumps to turn on the clutch, whereby the clutch Liquid developer pump, characterized by being configured to operate selectively in the same driving force Chiponpu. 2. 2. The liquid developing pump according to claim 1, wherein the passive rotary members of the plurality of clutch pumps are arranged on the same plane so that their rotation axes are parallel to each other.