JPS5938291Y2 - printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing machine, and more particularly to a printing machine that can reliably maintain the vertical movement of a printing block and the parallelism between the printing surface and the printing stand.

Conventional electric printing machines for electric numbering, etc., generally have a configuration in which a printing block is pressed down by a solenoid to print.

In this type of printing machine, if the printing surface of the printing block's character wheel is not parallel to the surface of the printing paper, it cannot be corrected, and the printed characters will have shading. Otherwise, the printing pressure may be concentrated on a part of the printing surface, causing problems such as the paper breaking.

It is difficult to avoid the above-mentioned deviation in the parallelism of the typeface due to errors in assembly, distortion of constituent members, etc.

In view of this, the present invention makes it possible to easily correct any discrepancies in the parallelism of the typeface while reliably maintaining the vertical vertical movement of the printing block, and even if there are assembly errors, they can be corrected in the end. This was done with the aim of providing a printing machine that can.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

The main components of the printing machine according to the present invention include the base 1
A printing arm 4 whose base end is pivotally supported by a shaft 3 to a machine frame 2 fixed on the base 1 so as to be able to swing vertically, and a printing arm 4 whose base end is attached to the base so as to be substantially parallel to the printing arm 4. An adjustment lever 6 that is pivotably supported on the frame 2 by a shaft 5 so as to be able to swing vertically; a support arm 9 that is pivotally supported by shafts 7 and 8 at the tips of the printing arm 4 and the adjustment lever 6; and this support arm 9. It has a printing block 10 supported by a printing block 10, a cam device 11 that swings the printing arm 4 in the vertical direction, and a printing spring 12 that presses the printing arm 4 downward.

The support arm 9 has an inverted shape, and the printing arm 4
The distance between the shafts 3 and 7 of the adjustment lever 6 is made equal to the distance between the shafts 5 and 8 of the adjustment lever 6 to form a four-bar link, and the support arm 9 is moved vertically in parallel.

The adjustment lever 6 has a threaded connection part 15 connected by screws 13 and 14 in the middle, and the length of the adjustment lever 6 can be arbitrarily selected depending on the amount of screwing. It is fixed in the adjusted position by a nut 16.

In the illustrated embodiment, the printing block 10 has a known numbering structure, and its press rod 17
is inserted into and fixed to the horizontal support surface 18 of the support arm 9, and a type block 19 having a large number of character rings is fixed to the lower end of the press rod 17. It is movable up and down along the inner surface of a frame body 20 suspended from the lower end of the frame body 20.

A compression spring 2 is provided between the frame body 20 and the support surface 18.
1 is interposed, and a paper presser 22 on the lower surface of the frame 20
The cam device 11 used in the illustrated embodiment has a shaft 23 rotated by a drive motor M attached to the machine frame 2. It has a cam 24 fixed on the top and a switch actuating cam 25 that stops the drive motor M with one revolution of the cam 24, and is pivotally supported on the side surface of the middle part of the printing arm 4 on the surface of the cam 24. The cam follower 26 is pressed into contact with the base 1 and the printing arm 4 by the indexing force of the printing spring 12 stretched between the base 1 and the printing arm 4.

The shape of the cam 24 includes a maximum radius region 24A that pushes the tip side of the printing arm 4 to the highest position, and a slowdown region 24B that is connected to this region 24A and gradually decreases in radius.
Continuing from this region 24B, a stepped portion 24 provides a drop for printing by pressing down the type block 19 of the printing block 10.
C, and the maximum radius area 2 from the lower part of this stepped portion 24C.
4A and a return region 24D whose radius gradually increases.

The switch actuating cam 25 has a cylindrical curved surface, and the tip of the switch actuating piece 27 of the stop switch S slides on this circumferential surface, and the tip of the switch actuating piece 27 falls into a part of the circumferential surface. A recess 27a is formed, and the stop switch S is turned off when the object falls into the recess 27a.

This off position is set in advance so that the cam follower 26 is located at the end position of the maximum radius region 24A of the cam 24 (as shown in the first figure).

Next, the operation of the above embodiment will be explained.

In the state shown in the first figure, the paper to be printed is inserted between the paper presser 22 at the bottom of the printing block 10 and the top surface of the base 1,
When the switch is turned on, the cam 24 rotates in the direction of the arrow due to activation of the drive motor M, and the cam follower 26 rotates in the direction of the arrow.
from the end of the maximum radius area 24A to the slowdown area 24
Gradually descend along B.

During this downward movement, the paper presser 22 of the printing block 10 comes into contact with the upper surface of the printing paper and presses it down.

Then, the cam follower 26 pushes down the press rod 17 against the spring 21 until it reaches the stepped portion 24c, and when the cam follower 26 falls from the stepped portion 24c to the lower part, the type block 19 of the printing block 10 is moved by the traction force of the printing spring 12. It descends rapidly and prints on the printing paper using the printing surface 19a.

The cam follower 26 that has fallen into the minimum radius portion of the cam 24 is gradually pushed up by the return region 24D and reaches the maximum radius region 24A, thereby pulling up the type block 19 to the uppermost position, and the cam follower 26 reaches the end of the maximum radius region 24A. At this time, the tip of the switch actuating piece 27 falls into the recess 25a of the switch actuating cam 25, turning off the stop switch S and completing one printing operation.

In the above operation, the vertical movement of the printing arm 4 causes the adjustment lever 6 to swing together through the support arm 9, so that the vertical movement of the support arm 9 is regulated by the printing arm 4 and the adjustment lever 6, and vertical movement is performed. .

If the parallelism between the printing surface 19a of the printing block 19 of the printing block 10 that moves up and down due to the above action and the printing paper is out of alignment, loosen the fixing nut 16 of the adjustment lever 6 and tighten the screws 13 and 14. By changing the length of the adjustment lever 6 depending on whether it is returned or not, the mounting angle of the support arm 9 can be changed, and by correcting the inclination of the printing block 10 supported by this, the parallelism of the printing surface 19a can be adjusted. .

Therefore, when assembling the printing block 10, the printing block 1
Even if there is an assembly error in the front and rear direction of the printer 9, it can be easily corrected after the printing machine is assembled, and unclear printing and damage to the paper to be printed can be prevented.

By using cams 24 of the cam device 11 that performs the printing operation with different heights of the stepped portions 24c, it is possible to arbitrarily select the height when the type block 19 of the printing block 10 starts falling. Therefore, it is possible to obtain a printing machine that corresponds to the number and thickness of sheets to be printed and the strength of printing pressure by simply changing the cam 24.

FIGS. 4A to 4C show an embodiment in which the stepped portion 24c can be lowered without replacing the cam 24, and an auxiliary cam 28 is provided on the side surface of the cam 24. The cam surface corrects the cam shape of the slowdown area 24B in the cam 24, and adjusts the drop of the stepped portion 24c at the end thereof.

The auxiliary cam 28 has a half-moon shape in the illustrated embodiment, and has a cam surface 28B having the same shape as the slowdown area 24B of the cam 24, and a base 28A of the cam surface 28B.
is pivoted to the cam 24 by a shaft 29 at a portion corresponding to the apex of the auxiliary cam 28 so that it always coincides with the maximum radius region 24A of the cam 24. Set screw 3 screwed into cam 24
1 is inserted so that the auxiliary cam 28 can be freely fastened to the cam 24.

Therefore, when the cam surface 28B of the auxiliary cam 28 is fixed so as to protrude most from the peripheral surface of the slowdown area 24B of the cam 24 as shown in FIG. 4A, the step portion is set to the maximum head L1. In addition, when the cam 24 is fixed at a position that is most reduced and coincides with at least the slowdown area 24B of the cam 24 as shown in FIG. In the case of fixing at the midpoint, an example of this is shown in Figure 4B, where an arbitrary head Ln
can be obtained.

As explained above, in the printing machine according to the present invention, the support arm supporting the printing block is supported by a four-bar link consisting of the printing arm and the adjustment lever, and the length of the adjustment lever is adjustable. The inclination of the printing block supported by the support arm can be finely adjusted, and the parallelism between the printing surface of the printing block and the paper to be printed can be accurately achieved.

Therefore, even if there is an error in the assembly of the printing block, it can be corrected to the correct orientation of the printing surface when used as a printing machine.
Therefore, there are various effects such as making it easier to manufacture printing blocks.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of an embodiment of the printing machine according to the present invention in a state before printing, Fig. 2 is a front view of the same, Fig. 3 is a longitudinal side view of the same during printing, Fig. 4A, B. C is an explanatory diagram of an operating state showing a modified embodiment of the cam of FIG. 1; 1...Base, 2...Machine frame, 4...
...Print arm 6...Adjustment lever 9...
・Support arm, 10...Printing block, 11・
...Cam device, 12...Printing spring, 1
5...Threaded connection part, 16... Fixing nut, 1γ... Push rod, 18... Support surface,
19...Type block, 19a...Type surface, 20...Frame body, 22...Paper presser, 24...Cam, 25 ...Switch actuation cam, 26...Cam follower, 27...
...Switch operation piece.

Claims (1)

[Scope of utility model registration request] a base, a printing arm whose base end is pivotally attached to the machine frame on the base and can swing vertically; and a base end is pivotably attached to the machine frame so as to be substantially parallel to the printing arm and can swing vertically. A freely movable adjustment lever, a support arm pivotally supported at the tip of the print arm and the adjustment lever, a print block supported by the support arm, and a cam device that swings the print arm in the vertical direction. and a printing spring that presses down the printing arm, the adjustment lever is equipped with a length adjustment mechanism, and a four-bar link consisting of the adjustment lever, the printing arm, and the support arm allows the printing block to be moved downward. What is claimed is: 1. A printing machine, characterized in that the printing block is supported vertically and vertically movably, and the parallelism of the printing surface of the printing block is adjusted by adjusting the length of an adjustment lever.