JPS6033017Y2 - printing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a printing machine, and particularly to a printing machine that can set an arbitrary printing pressure depending on the paper to be printed on.

[Prior art of the invention and its problems]

Conventional electric numbering and other electric printing machines generally have a structure in which a solenoid presses down the type block of the printing block to print, but in printing machines using this type of solenoid, the falling stroke of the type block cannot be adjusted. First, since printing is performed with a constant drop stroke regardless of the thickness or number of sheets of paper to be printed on, an excessive drop may occur if the printing machine is designed to handle approximately 1.2 sheets of paper to be printed on. As a result, there are various problems such as severe impact and noise during printing, abrasion of the printing surface, and cutting of the printing paper.

There is also a device that presses down the printing block to print by pushing up the other end of the arm that supports the printing block at one end using a cam (for example, Japanese Utility Model Publication No. 50-73521), but according to this, the vertical stroke of the printing block Since the pressure is constant, the printing pressure varies depending on the number of sheets of paper inserted into the printing position, making it impossible to stamp uniformly.
There are major problems in use, such as the difficulty of using the printer by pulling out the printed paper from the top and stamping it one after another.

[Purpose of invention]

In view of this, the present invention is adaptable to fluctuations in the number of sheets of printing paper to be used, and allows the height of the printing block to be set arbitrarily, thereby preventing excessive printing pressure and noise. This was done with the aim of providing a printing machine that can.

[Summary of the idea]

In order to achieve the above object, the present invention includes a printing arm whose base end is supported by a machine frame on a base so that it can swing vertically by a shaft, and a printing arm whose base end is also supported by a machine frame and which can swing vertically by a shaft. A support arm is connected to each tip of a freely supported length-adjustable adjustment lever by a shaft to support the adjustment lever so that it can be vertically raised and lowered, a printing block is attached to this support arm, and a printing block is attached to the printing arm. The cam of the cam device is engaged with a cam of a cam device that swings the printing arm in the vertical direction, and a printing paper drive spring that pulls the printing arm toward the base and performs the printing operation. , a maximum radius area that pushes the printing arm to the highest position, a slowdown area that connects to this area and brings the paper presser of the printing block into contact with the paper, a step part that has a required height following this area, and a step part of this step part. A return area continues from the bottom to the maximum radius area, and by changing the height of the stepped part, the lifting height of the printing block is changed, and printing is performed by the traction force of the printing drive spring. It is characterized by:

[Example of idea]

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 swingably supported by a shaft 3 on a machine frame 2 fixed on this base 1, and this printing arm 4.
a printing block 5 supported vertically on the tip thereof so as to be vertically movable; a cam device 6 that swings the printing arm 4 in the vertical direction; and a printing drive spring 7 that pulls the printing arm 4 downward. have.

At the tip of the printing arm 4, a lower end portion of a support arm 8 having an inverted shape is pivotally supported by a shaft 9.
An adjustment lever 1 whose upper end and the machine frame 2 are adjustable in length.
0, and the pivot 1 of this adjustment lever 10
The distance between the cam printing arm 4 and the cam printing arm 4 axes 3 and 9 are made equal to form a four-bar link, so that the support arm 8 can be moved vertically in parallel.

The length adjusting means of the adjusting lever 10 is connected by screws 13 and 14 as is well known, and can be arbitrarily selected depending on the screwing amount of the threaded connection part, and is fixed at the adjusted position by a fixing nut 15. It has been done.

The printing block 5 has a known numbering structure, and its press rod 16 is inserted into and fixed to the horizontal support surface 8a of the support arm 8, and the lower end of the press rod 16 has a large number of character rings. A type block 17 is fixed thereto, and this type block 17 is movable up and down along the inner surface of a frame 18 suspended from the lower end of the push rod 16.

A compression spring 1 is provided between the frame body 18 and the support surface 8a.
9 is interposed, and a paper presser 20 on the lower surface of the frame 1B
A required distance H is left between the base 1 and the upper surface of the base 1.

The cam device 6 includes a cam 22 fixed on a shaft 21 that is rotated by a drive motor M attached to the machine frame 2, and a switch actuating cam 23 that stops the drive motor M with one rotation of the cam 22. A cam follower 24, which is pivotally supported on the side surface of the intermediate portion of the printing arm 4, is pressed onto the circumferential surface of the cam 22 by the traction force of a printing drive spring 7 stretched between the base 1 and the printing arm 4. ing.

As shown in FIG. 5, the shape of the cam 22 includes a maximum radius area 22A that pushes the tip end of the printing arm 4 to the highest position, a slowdown area 22B that continues with this area 22A and gradually decreases the radius, and this area. Following 22B, print block 5
A stepped portion 22C having a drop that allows the type block 17 to be pressed down and printed, and a bottom portion 22D of this stepped portion 22C.
It has a return region 22E whose radius gradually increases from the maximum radius region 22A to the maximum radius region 22A.

The switch operating cam 23 has a cylindrical peripheral surface, and the tip 25 of the switch operating piece 25 of the stop switch S is attached to this peripheral surface.
a is in sliding contact with the switch actuating piece 2 on a part of its circumferential surface.
A recess 23a is formed into which the tip 25a of the stopper 5 falls into, and the stop switch S is turned off when it falls into the recess 23a.

This off position is set in advance so that the cam follower 24 is located at the end position of the maximum radius area 22A of the cam 22 (as shown in the first figure).

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

In the state shown in the first figure, when the paper to be printed is inserted between the paper presser 20 at the bottom of the printing block 5 and the top surface of the base 1 and the switch is turned on, the drive motor M starts and the cam 2
2 rotates in the direction of the arrow, and the cam follower 24 moves from the end of the maximum radius area 22A of the cam 22 to the slowdown area 22B.
gradually descend along the

During this downward movement, the paper presser 20 of the printing block 5 contacts and presses the upper surface of the printing paper as shown in the third figure.

Then, the cam follower 24 pushes down the press rod 16 against the spring 19 until it reaches the stepped portion 22c, and when the cam follower 24 falls from the stepped portion 22C toward the bottom 22D, the tractive force of the printing drive spring 7 causes the characters on the printing block 5 to be pressed down. The block 17 descends rapidly, and as shown in the fourth figure, printing is performed on the printing paper using its printing surface.

The cam follower 24, which has fallen into the minimum radius portion of the cam 22, is gradually pushed up by the return region 22E and reaches the maximum radius region 22A, thereby pulling the printing block 17 to the highest position, and the cam follower 24 reaches the end of the maximum radius region 22A. When this is reached, the tip end 25a of the switch actuating piece 25 falls into the recess 23a of the switch actuating cam 23, turning off the stop switch S and completing one printing operation.

Therefore, in the above case, by using cams 22 with different heights of the stepped portions 22G, the height when the type block 17 of the printing block 5 starts falling can be arbitrarily selected, so the number of sheets of paper to be printed can be selected. It is possible to obtain a printing machine that meets the requirements for printing pressure, thickness, and strength of printing pressure by simply replacing the cam 22.

[Effect of idea]

As explained above, in the printing machine according to the present invention, the printing arm supporting the printing block at the tip is raised by the cam against the bias of the stamping drive spring, and the slowdown area formed in the cam gradually increases the printing arm. Since the configuration is such that printing is performed by lowering the paper presser to bring the paper presser into contact with the paper, and then dropping the type block of the printing block using the step part of the cam, it is possible to print depending on the nature, number, thickness, etc. of the printing paper to be used. By selecting the height of the cam step to provide the optimum printing pressure for that printing, it is easy to create a printing machine that is compatible with the printing pressure. However, it is possible to minimize the impact and noise generated by printing due to unnecessary strong hitting force, and the recoil against the printing block is also reduced, preventing damage to that part and damage to the printing paper. Can be done.

Since the printing pressure is adjusted by the stepped portion of the cam, it is independent of the output of the drive motor and can be operated satisfactorily even with a small output.

In addition, the cam is used to raise the printing arm, and the printing is stamped by the traction force of the printing drive spring, so even if the number of sheets of paper inserted changes, there is no large difference in printing pressure, and the printing on the securities is Even printing in which a large number of sheets are inserted and pulled out one by one can be used satisfactorily, and the range of use can be significantly expanded.

Furthermore, since the printing arm is always pulled up to the highest position by the maximum radius area of the cam, it does not affect the insertion of printing paper in any way, and has various effects such as no inconvenience in use.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of an embodiment of the printing machine according to the present invention before printing, Fig. 2 is a front view of the same, and Fig. 3 shows the paper presser of the printing block in contact with the paper during printing. Figure 4 is a vertical side view when printing, and Figure 5 is a side view when printing.
FIG. 3 is a front view showing only the cam shown in the figure. 1...Base, 2...Machine frame, 4...
...Print arm, 5...Print block, 6...
... Cam device, 7 ... Printing drive spring, End ... Support arm, 10 ... Adjustment lever,
16...Press rod, 17...Type block, 18...Frame, 20...Paper presser, 2
2...Cam, 22A...Maximum radius area, 22B...Slowdown area, 22C...
...Step part, 22D...Bottom, 22E...
...Return area, 23...=...Switch operation cam,
24...Cam follower, 25...Switch actuation piece, S...Stop switch, M...
...Drive motor.

Claims (1)

[Scope of utility model registration request] A printing arm 4 whose base end is supported by a machine frame 2 on a base 1 so as to be swingable in the vertical direction by a shaft 3; A shaft 9 with a support arm 8 at each end with an adjustable adjustment lever 10,
12 to support the adjustment lever 10 so that it can be vertically raised and lowered, and the printing block 5 is attached to this support arm 8.
A cam 22 of a cam device 6 for vertically swinging the printing arm 4 is engaged with the printing arm 4.
The cam 22 of the cam device 6 is engaged with a printing drive spring 7 that pulls the cam toward the base 1 to perform a printing operation.
Maximum radius area 22A that pushes the printing arm 4 to the highest position
The paper presser 20 of the printing block 5 is connected to this area.
A step section 22C that continues from this section and has a required drop, and a return section 22E that continues from the bottom section 22D of this step section to the maximum radius area, This printing machine is characterized in that the lifting height of the printing block 5 is changed by changing the head, and printing is performed by the traction force of a printing drive spring 7.