JPS5915832B2 - Line printer electromagnetic solenoid device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic solenoid device for a line printer.

Conventionally, line printers have a system in which multiple hammers are used to hit the type on a continuously rotating type drum, and the drive of the hammers is generally controlled by an electromagnetic solenoid that receives print signals. I have to.

According to this method, the electromagnetic solenoid device requires a relatively large suction force 5 and is inherently large, and the same number of hammers are required.As a result, the electromagnetic solenoid device occupies a large space, and as a result, the line printer It had the disadvantage of being large in size. The present invention has been made in order to eliminate the above-mentioned drawbacks10, and its object is to provide at least two actions for controlling two adjacent hammers, respectively, in a line printer that controls the drive of hammers using electromagnetic solenoids. By configuring an electromagnetic solenoid with a solenoid core having magnetic poles and one electromagnetic coil wound around the core, the number of electromagnetic solenoids can be approximately half of the number of hammers, and therefore, on the one hand, the number of printed digits can be reduced. The more lines there are, the more they can contribute to miniaturization of the overall configuration, and on the other hand, the volume restriction for one electromagnetic solenoid is relaxed20, and the line can be easily configured to have a sufficiently large suction force as desired. To provide electromagnetic solenoid devices for printers.

The present invention will be explained in detail below using an example in which the present invention is applied to a line printer.

In the drawing, reference numeral 1 denotes a machine frame on which a type drum 2 made of an elastic material such as hard rubber is rotatably installed horizontally. Type 3 is engraved, and each digit is engraved with type 3.
In addition to having a plurality of
As can be understood from the figure, the printed characters 3 in adjacent digits are arranged in a staggered manner. 4 is an ink roller, which is installed in the machine frame 1 and is always in pressure contact with the type dotem 2, and is rotated by the friction to apply ink to the type 3. 05 is a single spring ■5 Cuts into the material board Therefore, the same number of plate springs as the number of digits are formed, and these common side parts 5a are attached to a base 6 made of synthetic resin by insert molding, and are supported by the machine frame 1 via the base 6. At the free end of each of these leaf springs 5 facing the type drum 2, there are print hammers made of synthetic resin that are arranged in the direction of the digits, facing each digit position of the type drum 2 with a printing paper 7 interposed therebetween. 8 are integrally supported by insert molding,
Similarly, these print hammers 8 are adapted to be independently biased to move them to the printing position.

9 is the same number of first leaf springs as the number of digits, 10 is a second leaf spring facing each of these first leaf springs 9, and each of these is made by cutting a single spring material board. The base ends of these common sides are connected to a support column 11 made of synthetic resin by insert molding, and the support column 11 is installed horizontally on the machine frame 1. A first spring 9 and a second spring 10 form a set of leaf springs, and the same number of leaf springs as the print hammers 8 are provided.

τ′. ? Nakanitoge = Rafujigoichi 8 is in a positional relationship that can be sandwiched from above and below, and is bent into a semicircular shape for the purpose of increasing strength, and the tip portions 9a and 10a of each are the engagement steps of the print hammer 8 8a, 8b, and when at least one of them is in the engaged state, the print hammer 8 is held in the rest position.

Reference numeral 12 denotes a first cam group consisting of a plurality of eccentric cams 12a located between the first and second leaf springs 9 and 10, respectively, and corresponding to the girders, each of which is: ″I, ′.″, ↓ ;.

;--:=〒゜曽艷 控≠ 〒〒゜浽艷控≠对进行弹性运动，并且这样的端部9a和10a和图形头8的按针8a。
The eccentric cams 12a are designed to alternately release the engagement between the eccentric cams 12a and 8b, and in particular, each eccentric cam 12a is designed to release the engagement between the adjacent eccentric cams 12a so that the release operation is in opposite phase between each set corresponding to the adjacent girder. The cams 013, whose eccentric directions are set to be opposite to each other so as to have a phase difference of 180 degrees, are in the second cam group and abut on the intermediate portions of the leaf springs 5 corresponding to each digit. The print hammer 8 is made up of 14 eccentric cams 13a, and as the eccentric cams 13a rotate, the print hammer 8 can be forcibly returned from the printing position to the rest position against the spring force of the leaf spring 5. In particular, in order to ensure that the returning action is performed in opposite phases to each other in adjacent girders, the eccentric directions of the eccentric cams 13a are set such that the adjacent ones have a phase difference of 180 degrees. 01, which are determined to be in opposite directions
Reference numeral 4 denotes one pair of leaf springs 9, 10 and the other pair of leaf springs 9 adjacent to this pair in digit correspondence.
, 10, in other words, there is one print hammer 7 for every two adjacent print hammers 8.
This is a separate electromagnetic solenoid. This electromagnetic solenoid 14 has two solenoid cores 15 and 16 made of a plate-shaped magnetic material having L-shaped working magnetic poles 15a and 16a, respectively, at two locations near each end. 15a and 16a are overlapped back to back so as to be spaced apart from each other, and one electromagnetic coil 17 is placed around the outer periphery of the overlapped portion.
As a result, the overlapping portion of the solenoid cores 1.5 and 16, that is, the width L1, which is the thickness of the coil winding portion, is the same as that of the two working magnetic poles 15a.
, 16a, and since the electromagnetic coil 17 is wound around this part, an increase in the thickness of the electromagnetic solenoid 14 itself is suppressed. In this way, a large number of electromagnetic solenoids 14 are arranged in the digit direction. In addition, the distance between the working magnetic poles 15a and 16a is determined to be approximately the same as the pitch between two adjacent print hammers 8. Each solenoid core 15, 16 included in each electromagnetic solenoid 14, such as 0 or more, has these working magnetic poles 15a, 1
At a position where 6a faces each of the second leaf springs 10, 10 downwardly, an engaging means is attached to an engaging piece 19 made of synthetic resin that is erected on a printed circuit board 18 arranged in advance on the machine frame 1. 0 is maintained in a digit-wise arrangement by
Reference numeral 20 denotes a print guard disposed in the machine frame 1 so as to substantially surround the type drum 2 and ink roller 4 to prevent printing paper from becoming dirty; 21 indicates the print guard so as to form a paper guide path 22 for guiding the printing paper 7; 20 and a paper guide provided in opposing relation to each said type drum 2.
There are openings 23 and 2 in the area facing the print hammer 8.
025 where 4 is formed is a rubber paper feed roller, 2
A drive motor 6 serves as a drive source for the type drum 2, the first cam group 12, the second cam group 13, and the paper feed roller 25. In the above, the type drum 2, the first and second cam groups 12 and 13 are constantly rotated, the first cam group 12 and the second cam group 13 have the same rotational speed, and the first cam group 12 and the second cam group 13 have the same rotational speed. The time required for one revolution of the cam group 12 is determined to be the same as the time required to move one character among the plurality of characters 3 provided at each digit on the type drum 2. The printing operation of the line printer with the above configuration will be explained using one digit as an example. 0, that is, the first cam group 12
As the eccentric cam 12a rotates, the first leaf spring 9 and the second leaf spring 10, which is opposed to the first leaf spring 9 and is in a pair of relationship with each other, move their tips 9a and 10a to the engagement step of the print hammer 8. As long as these three states are repeated, the print hammer 8 is held at the rest position. 0, and the print signal is synchronized with the eccentric cam 12a and is delivered to the electromagnetic solenoid 14 when the second leaf spring 10 is pressed downward, that is, to the disengaged position, by the eccentric cam 12a,
As a result, the electromagnetic solenoid 14 has its solenoid core 1
5 (or 16) to its working magnetic pole 15a (or 1
6a) and the pressed second leaf spring 1
In this holding state, the eccentric cam 12a continues to rotate, and the first leaf spring 9 is moved upward, and its tip 9a is moved to the engagement step of the print hammer 8. When disengaged from 8a, the print hammer 8 is rapidly moved onto the printing drum 2 by the spring force of the leaf spring 5, and strikes a predetermined type 3 through the printing paper 7 to perform printing. It should be noted that immediately before the above-described hitting action of the print hammer 8, the eccentric cam 13a of the second cam group 13 is sufficiently far away from the leaf spring 5. After the above-mentioned hitting action is completed, the eccentric cam 13a Reference numeral 13a designates the print hammer 8 against the spring force of the leaf spring 5, and the tips 9a, 10a of both leaf springs 9, 10 whose opposing distance has already been restored to the minimum due to the rotation of the eccentric cam 12a.
The print hammer 8 is forcibly moved from the print position to the print body stop position so as to insert the print hammer 8 between its own engagement steps 8a, 8b and the respective tips 9a, 10a of both leaf springs 9, 10. The engagement with the printer is restored and the printer is ready for the next printing operation. The above has explained the printing operation for one digit, but in the line printer of this embodiment, the eccentric cams 12a, 13a of the first and second cam groups 12, 13
Since the eccentric directions of the leaf springs 9, 10 and the print hammer 8 are configured to be opposite to each other in the adjacent girders, the disengagement operations between the leaf springs 9 and 10 and the print hammer 8 are performed alternately in the adjacent girders, that is, in opposite phases. On the other hand, the forcible return operation of the print hammer 8 to the rest position by the first cam group 13 is also performed alternately, that is, in an antiphase time relationship, in adjacent columns. The action is that the second leaf spring 10 is held in the unmoored position by the working magnetic pole 15a (or 16a) of one solenoid core 15 (or 16) of the electromagnetic solenoid 14, and that the first leaf spring 9 is held in the unmoored position. This is done when the following two conditions are met: disengagement is achieved by the eccentric cam 12a of one cam group 12. Therefore, as described above, two sets of cams corresponding to two adjacent girders are disengaged. Based on a total of two sets of leaf springs, one set of leaf springs 9, 10 corresponding to one digit, and another set of leaf springs 9, 10 corresponding to other digits adjacent thereto. In other words, although one electromagnetic solenoid 14 is provided for two print hammers 8, and two solenoid cores 15 and 16 are attached to this, one electromagnetic solenoid 14 is activated by a print signal. When the two solenoid cores 15 and 16 are excited and generate attraction force at the same time, the two print hammers 8 corresponding to the excited electromagnetic solenoid 14 will not simultaneously cause a striking action, and the print signal will not be affected. Only one corresponding print hammer 8 performs the striking or printing operation.

In this way, after the required printing operation for one line in the digit corresponding to the leading phase is performed, the required printing operation in the digit corresponding to the lagging phase is performed during that one line, and then,
The printing paper 7 is fed by one line. Therefore, for one of the two digits whose printing operations are performed in an antiphase time relationship, one solenoid core 15 of one electromagnetic solenoid 14 belonging to these digits is activated by one solenoid core 15 of the corresponding one print hammer 8. For the other digit, the other solenoid core 16 controls the drive of the corresponding one print hammer 8, so the electromagnetic solenoid ends up being one solenoid core with two working magnetic poles. It is understood that it essentially consists of an electromagnetic coil. As a result, the number of electromagnetic solenoids 14 can be reduced to half the number of digits of the type drum 2, and hence the number of print hammers 8, and when these electromagnetic solenoids 14 are arranged in a row in the direction of the digits, they occupy a large space in the direction in which they are arranged. Therefore, on the one hand, the larger the number of digits, the further downsizing of the line printer can be achieved, and on the other hand, the restriction on the volume of one electromagnetic solenoid 14 is relaxed, so that the printing operation can be ensured. This has the effect that it can be easily configured to have a sufficiently large suction force in accordance with the requirements.The application of the present invention is limited only to line printers using the control system as in the above embodiments. As described above, the present invention provides a line printer in which hammer drive is controlled by an electromagnetic solenoid, in which at least two working magnetic poles are provided to respectively control two adjacent hammers. By configuring an electromagnetic solenoid device with a solenoid core and one electromagnetic coil wound around the core,
The number of electromagnetic solenoids is about half of the number of hammers, and therefore, on the one hand, the larger the number of printed digits, the more it can contribute to miniaturization of the overall structure, and on the other hand, the restrictions on the volume of one electromagnetic solenoid are relaxed. It can be easily constructed to have a sufficiently large attractive force as desired, and in particular, the core can be formed by superimposing two magnetic bodies each having a working magnetic pole corresponding to each of the two hammers. An electromagnetic coil is commonly wound around the outer periphery of the core, and the width of the overlapping portion of the core around which the electromagnetic coil is wound is made narrower than the working magnetic pole spacing, which is made to be approximately the same as the hammer pitch. Therefore, it is possible to provide an electromagnetic solenoid device for a line printer that has excellent effects such as the electromagnetic solenoid itself becoming thinner and making it possible to further downsize the printer.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a line printer showing an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIGS. 3 and 4 are a perspective view and a cross-sectional view, respectively, of an electromagnetic solenoid. In the figure, 2 is a type drum, 8 is a print hammer 9 and 1
0 are first and second leaf springs, 12 and 13 are first and second cam groups, 14 is an electromagnetic solenoid, 15,
16 is a solenoid core (magnetic material), 15a and 16a are working magnetic poles, and 17 is an electromagnetic coil.

Claims (1)

[Claims] 1. In a line printer that controls hammer drive using an electromagnetic solenoid, in order to control two adjacent hammers, a solenoid core is formed by overlapping two magnetic bodies each having at least one working magnetic pole corresponding to each hammer. and an electromagnetic coil is commonly wound around the outer periphery of the overlapping portion, the working magnetic pole interval between the two magnetic bodies is approximately the same as the hammer pitch of the two hammers, and the electromagnetic coil of the solenoid core is An electromagnetic solenoid device for a line printer, characterized in that the width of a portion around which a coil is wound is narrower than the working magnetic pole interval between the two magnetic bodies.