JPS5932316B2 - Pressure printing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pressure printing method in a printing device.

As shown in FIG. 1, a conventional pressure printing device uses a printing roller body 23 rotatably held between a bearing plate 22 provided with a circular hole-shaped bearing portion 22a fixed to a crankshaft 21 that rotates continuously in one direction. has been completed.

This method has the great advantage of being able to obtain high printing pressure with low torque by pressing the printing roller body 23 while rolling and contacting the character surface of the printing wheel 24. It has the features of a capable printing device. However, this method has the disadvantage that as the character surface of the type wheel becomes larger, the diameter of the rotation outer circumferential trajectory of the printing roller body must be increased. For this reason, a printing device having the feature of printing large characters has a major drawback in that the entire device is large and wastes space. In addition, this method has a major drawback in that the printing roller body is far away from the character surface of the type wheel, that is, the printing paper, at times other than 9 during pressure printing, so the printing paper cannot be easily inserted into the specified position when inserting the printing paper. It also has Furthermore, this method also has the disadvantage that in order to confirm the printed characters immediately after printing, the printing paper must be moved to a large amount immediately after printing, which forces the printing line pitch to be increased. are doing.
Furthermore, the torque (load) during pressure printing in this method also has the disadvantage that the peak torque increases in direct proportion to the number of printed characters, as shown in FIG. By the way, as a method of eliminating the waste space of this method, a swing printing method as shown in FIG. 3 can be easily devised. In other words, in the conventional unidirectional continuous rotation press printing method, the drive method is changed to an arbitrary angle α (α<
3600)). According to this oscillation method, even if the outer circumferential rotation locus of the printing roller body is increased, the entire device can be made smaller by reducing its operating angle α, and the printing roller body is required to be smaller than the character surface of the type wheel. Since there is no need for more escape, there are advantages such as the printing roller body itself can be used as a feeding guide for the printing paper even when the printing paper is inserted.

However, with this swinging method, the only options are to print the same character twice by pressing it back and forth, or to print one line on the outward pass and print the next line on the return pass. In this case, reciprocating printing of the same character not only has the serious drawback of print misalignment, but also requires twice as much printing time, reducing printing speed. Furthermore, in the case of reciprocating line feed printing, the direction of the stroke with respect to the printing paper is reversed, resulting in another serious drawback that the pitch between lines becomes irregular.

As described above, the conventional pressure printing method and the pressure printing method that will be easily devised in the future have a number of serious drawbacks, and these serious drawbacks cannot be easily eliminated. The present invention eliminates such drawbacks, and its purpose is to print large characters under pressure without increasing the size of the device.

Another purpose is to make printed characters directly visible immediately after printing by moving the printing paper as small as possible, that is, by reducing the printing line pitch. Yet another object is to make the insertion of printing paper easy and reliable. Yet another purpose is
The purpose is to make the peak torque of pressure printing smaller than before even if the number of printed characters is increased. The present invention will be described in detail below based on Examples. In FIG. 4, the crankshaft 1 is driven to reciprocate and swing at an appropriate rotation angle α by a drive mechanism (not shown).

Bearing plates 2-1 and 2-2 are fixedly installed on the crankshaft 1 and are driven to reciprocate and swing together with the crankshaft 1. The bearing plates 2-1 and 2-2 have a bearing portion 2a with a large rotation radius.
A bearing part 2b having a small rotation radius is provided, and these parts are connected by a groove to form a substantially L-shaped bearing hole. Furthermore, the approximately L-shaped bearing holes of the bearing plates 2-1 and 2-2 have a phase difference θ (θ
〉O) and is fixed to the crankshaft 1. Further, a printing roller body 3 is arranged between the bearing plates 2-1 and 2-2, and the shaft 3a of the printing roller body 3 is formed into a substantially L-shaped bearing portion consisting of 2a and 2b of the bearing plates 2-1 and 2-2. It is rotatably held. Reference numeral 6 in the figure denotes a type ring having a character surface 6a on its circumferential surface. The type wheel 6 rotates as appropriate and stops when the center of any character surface 6a comes to a line connecting the crankshaft 1 and the center of the type wheel 6. At this time, the crankshaft 1, that is, the bearing plate 2-1, is rotated counterclockwise. After the character surface 6a is pressure-printed on the printing paper 7 by the printing roller body 3 held between the rollers 3 and 2-2, the printing roller body 3 is selectively rotated to return to the standby position.

In the figure, reference numerals 4 and 5 are print roller regulating springs that also serve as paper guides, and square holes are provided in the portions of the type wheel 6 that correspond to the printed characters 6a.
is pressed against the character face 6a of the type ring 6. The print roller regulating springs 4 and 5 are made of flexible members, and both ends are supported by a member 8 constituting a frame (not shown). In the present invention configured as described above, first, any type wheel 6 comes to rest with any commanded character face 6a facing the center of the crankshaft 1. When all the type wheels 6 are brought to rest with predetermined character faces 6a facing the center of the crankshaft 1, the crankshaft 1 is rotated counterclockwise from the standby state (solid line state in the figure). When the crankshaft 1, that is, the bearing plates 2-1 and 2-2 is rotated, and the rotating shaft portion 3a of the printing roller body 3 enters the long rotation radius bearing 2a, the rotating outer periphery of the printing roller body 3 is as shown by the two-dot chain line 31. Move along the arrow. As the printing roller body 3 moves, the printing roller regulating springs 4 and 5 and the printing paper 7 sandwiched therebetween are gradually brought closer to the printing character surface 6a of the printing wheel 6. Furthermore, crankshaft 1
When is rotated counterclockwise, the printing paper 7 is finally completely pressed against the character surface 6a. And crankshaft 1.
The pressing force becomes maximum when the centers of the printing roller body 3 and the type ring 6 are aligned on a straight line. However, in the present invention, the center of the character surface 6a of each type ring 6 coincides with the straight line connecting the crankshaft 1 and the center of the type ring 6, but approximately L of the bearing plates 2-1 and 2-2 Since the character bearing grooves 2a and 2b are provided with a phase difference θ, the character bearing grooves 2a and 2b are different from each other.
When the centers of the printing roller body 3 and the crankshaft 1 are aligned on a straight line, that is, when the pressing force is maximum, it differs for each type wheel 6. In this way, the printing roller body 3 passes the center of the character on the character surface 6a of the last type wheel 6 and further advances, and the printing roller body 3 passes the character end of the character surface 6a and printing is completed.The crankshaft 1 then moves counterclockwise. stop rotating. In this state, the printing roller body 3 is subjected to a force in the upper direction of the drawing by the printing roller regulating springs 4 and 5. Then, when the crankshaft 1 rotates back clockwise, the rotation shaft portion 3a of the printing roller body 3 moves from the long rotation bearing portion 2a' of the bearing plates 2-1 and 2-2 to the short rotation bearing portion 2b', and the crankshaft 1 As the printing roller rotates in the clockwise direction, the printing roller is supported by the printing roller regulating spring 4,
The printing roller 3 moves horizontally in the drawing as shown in FIG. At this time, the printing roller body 3, the printing paper 7, and the character surface 6a of the type wheel 6 are completely separated by the print roller regulating springs 4 and 5, so that the rotation of the type wheel 6 to return to the standby state is caused by the above-mentioned crankshaft 1. This is done at the same time as the return rotation. When the crankshaft 1 returns to the standby state (solid line state in the figure), the printing roller body 3 also returns to the standby state. In this manner, the center and outer periphery of the printing roller body 3 move 28 times as indicated by the two-dot chain lines 3-2 and 3-1 by the reciprocating swing of the crankshaft 1 to perform a printing operation. FIG. 5 shows the relationship between pressure printing load torque and rotation angle based on the present invention. Since there is a phase difference in the peak torque T1 of each type wheel 6, the overall peak torque TN is T1×N(N is smaller than the number of type rings). FIG. 6 shows another embodiment in which the printing roller body 3 is used as a guide for the printing paper 7, which was not possible in the conventional printing system, and the paper feed roller 10 or the paper pressing roller 11 is placed close to the printing mechanism. Since the printing paper path, which is the most problematic issue in printing devices, can be shortened, it also provides space for arranging other mechanical parts such as the motor 12, making the entire device smaller, or improving the overall layout of the printing device. A large degree of freedom can be obtained. As described above, the present invention has an extremely simple structure in which the shape of the bearing part of the printing roller is changed from the conventional circular shape to a substantially L-shape, and a phase difference is provided between both bearing parts. This makes it possible to perform pressure printing by reciprocating swinging at one rotation angle, and also provides the wonderful effect of reducing the load peak torque of pressure printing.

[Brief explanation of the drawing]

Figures 1 and 3 are cross-sectional views of a conventional pressure printing device, Figure 2 shows the load torque and rotation angle of the conventional pressure printing device, and Figures 4 and 6 show an example of the present invention. A cross-sectional view showing,
FIG. 5 shows the load torque and rotation angle of the pressure printing device according to the present invention. 1... Crankshaft, 2-1, 2-2...
・Bearing plate, 3... Printing roller body, 4, 5...
...Print roller regulation spring, 6...Type wheel.

Claims (1)

[Scope of Claims] 1. In a printing device that performs pressure printing by appropriately rotating a plurality of type wheels having a plurality of characters and symbols on their circumferential surfaces, aligning them stationary, and press-printing them, a type wheel fixed to a crankshaft that reciprocates and rotates on a major radius. A pair of bearing plates having a substantially L-shaped bearing groove connecting a bearing groove and a short-radius rotating bearing groove, a printing roller body that fits into the bearing groove of the bearing plate and is rotatably held, and the printing roller. and a printing roller regulating means that acts to separate the printing roller body from the character and symbol surface of the printing wheel, and on the forward path of reciprocating swinging, the printing roller body is fitted into the long axis rotation bearing of the bearing plate. A press printing device characterized in that the printing roller body is rotationally driven, and on the return trip, the printing roller body is fitted into a short radius rotating bearing groove of the bearing plate and is rotationally driven. 2. Claim 1, characterized in that the printing roller regulating means includes a paper guide member made of a flexible member.
The pressure printing device described in Section 1. 3 The bearing grooves of the pair of bearing plates are respectively θ (θ
>0) A pressure printing device according to claim 1, characterized in that a phase difference is provided.