JPH07110548B2 - Rubber stamp - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In a rubber stamp, a printing unit is supported in a floating manner with respect to a fixed frame, and an operating member is pushed down against a spring means to press the printing unit against the paper surface for printing. There is a form. The present invention relates to a floating stamp face type rubber stamp having the function of adjusting the pressure contact force of a printing unit.

[0002]

2. Description of the Related Art For example, in a rubber stamp capable of continuous marking such as a porous mark, a floating stamp surface type rubber stamp structure is often adopted. In this type of conventional rubber stamp, the operating stroke of the operating member is fixed to a fixed length, so the pressure contact force of the printing unit tends to vary due to the processing accuracy and assembly accuracy of the components, and for example, imprinted characters and figures Printing defects such as fading and crushed characters often occurred. In order to eliminate the above printing failure, the operation stroke may be adjusted to change the pressure contact force of the printing surface. A rubber stamp with an adjusting screw, which is presumably intended to change the stroke, is
It is well known from the publication. In this, the screw shaft for adjustment is screwed and fixed to the printing unit, the intermediate member for adjustment and the handle for operation functioning as a lock nut are screwed into the screw shaft, and the intermediate member is moved by the handle at an arbitrary vertical position. The operation stroke can be changed by locking and fixing.

[0003]

In the case where the stroke is adjusted by the adjusting screw as described above, the fine adjustment is difficult because the minimum adjustment amount is restricted by the screw pitch. For example, when a screw having a nominal diameter of 8 mm and a pitch of 1.25 mm is used, the adjustment amount when the screw is moved forward and backward by a quarter turn becomes 0.3 mm or more, and the adjustment amount becomes coarse.

Generally, the molding accuracy of rubber stamps tends to vary widely due to slight differences in molding conditions, and the printing quality is greatly influenced by the variation in the pressing force of the user and the slight variations in processing and assembly. I will end up. To fully absorb such variations and improve print quality, 0.
It is necessary to make a fine adjustment of about 05 to 0.1 mm, and it is difficult to adjust the pressure contact force of the printing unit to a suitable value and according to each user in the adjusting screw system as described above.

The present invention solves the above-mentioned problems, and its main object is to make it possible to adjust and change the pressure contact force of the printing unit with high accuracy. Another object of the present invention is to allow a user to easily change the pressure contact force of the printing unit according to his / her preference. Still another object of the present invention is to make it possible to adjust the pressure contact force with high accuracy even for a component processed with general processing accuracy, and to enable fine adjustment without increasing the manufacturing cost. is there.

[0006]

The present invention is a fixed frame 1
And a printing unit 2 housed in the fixed frame 1 so as to be movable up and down, and an operation member 3 for imprinting the printing unit 2, and between the operation member 3 and the printing unit 2, the printing unit 2 is provided. Screw 1 that defines the operating stroke S of
A rubber stamp provided with a stroke adjusting mechanism 4 composed of 3 is assumed. The first aspect of the present invention relates to a printing unit 2 and an operating member 3.
Are connected by a support shaft 19 fixed to the inner surface of the operation member 3 and a boss 10 projectingly provided on the upper surface of the printing unit 2 and fitted over the support shaft 19 so as to be vertically movable relative to each other. ,
The differential screw 13 includes a first screw 15 formed on the upper peripheral surface of the support shaft 19, and a second screw 16 formed on the peripheral surface of the boss 10.
It is composed of a tubular differential screw main body 17 that is screwed into both screws 15 and 16 at the same time. The two screws 15 and 16 are formed so that the screw pitches are slightly different. The adjusting dial 14 for rotating the differential screw main body 17 is provided between the adjusting dial 14 and the operating member 3, and the spring 28 for urging the operating member 3 upward is arranged between the adjusting dial 14 and the operating member 3. It is characterized by being present.

The second aspect of the present invention is the operation member 3 and the printing unit 2.
Are coupled to each other via a support shaft 19 so as to be movable together with each other in the vertical direction, and the differential screw 13 has a first screw 15 formed on the peripheral surface of the support shaft 19 and a cylinder screwed to the first screw 15. -Shaped differential screw main body 17 and a nut 38 having a second screw 16 screwed with a male screw on the peripheral surface of the differential screw 17,
16 is formed so that the screw pitch is slightly different,
The nut 38 is provided on the upper surface of the fixed frame 1 so that the guide boss 3 is erected.
An adjustment dial 14 for pivotally operating the differential screw main body 17 is provided between the differential screw main body 17 and the fixed frame 1 so that the adjustment dial 14 can be freely moved up and down. A spring 28 for urging the operating member 3 upward is arranged between the operating member 3 and the operating member 3.

A third aspect of the present invention is a printing unit 2 and an operating member 3.
Are connected by a support shaft 19 fixed to the upper surface of the printing unit 2 and a boss 11 projectingly provided on the inner surface of the operation member 3 and fitted onto the support shaft 19 so as to be vertically movable relative to each other. ,
The differential screw 13 has a second screw 16 formed on the lower peripheral surface of the support shaft 19, a first screw 15 provided around the boss 11, and a tubular differential screwed at the same time with both screws 15 and 16. Screw main body 1
7, the two screws 15 and 16 are formed such that the screw pitches thereof are slightly different, and between the differential screw main body 17 and the fixed frame 1, an adjustment dial 14 for rotating the differential screw main body 17 is provided. Is provided, and a spring 28 for urging the operation member 3 upward is arranged between the adjustment dial 14 and the operation member 3.

In a fourth aspect of the present invention, the differential screw 13 is formed on the peripheral surface of the boss 10 projectingly provided on the upper surface of the printing unit 2.
A spindle 19 having a screw 16, a cylindrical differential screw main body 17 screwed to the second screw 16, and a first screw 15 screwed to a female screw on the upper inner surface of the differential screw main body 17 on the peripheral surface. Both screws 15 and 16 are formed so that the screw pitches are slightly different, and the lower portion of the support shaft 19 is internally fitted and supported by the boss 10 so that it can be moved only up and down. 1
A spring 28 that urges the printing unit 2 to move upward via the stroke adjusting mechanism 4 is disposed between the fixed frame 1 and the fixed frame 1, and the operating member 3 is detachably attached to the upper end of the spindle 19. It is characterized by being fitted.

A fifth aspect of the present invention is a printing unit 2 and an operating member 3.
Bosses 10 and 11 are respectively provided on the upper and lower opposing surfaces of the boss 10, and the differential screw 13 has a first screw 15 formed on the inner surface of the boss 11 and a second screw 16 formed on the inner surface of the boss 10. And a rod-shaped differential screw main body 17 that is screwed into both screws 15 and 16 at the same time. Both screws 15 and 16 are formed so as to have a slightly different screw pitch.
7, a spring 28 for urging the operation member 3 upward is arranged between the adjustment dial 14 fixed in the middle of 7 and the fixed frame 1.

A sixth aspect of the present invention is a printing unit 2 and an operating member 3.
And the support shaft 19 fitted and fixed to the boss 10 on the upper surface of the printing unit 2 and the support shaft 19 protruding from the inner surface of the operation member 3.
Is connected with a boss 11 which is fitted so as to be vertically movable relative to each other, and the differential screw 13 is connected to each of the bosses 11
The first screw 15 and the second screw 15 respectively formed on the peripheral surface of 0.
It is composed of a screw 16 and a tubular differential screw main body 17 that is screwed into both screws 15 and 16 at the same time. Both screws 15 and 16 are formed so that the screw pitch is slightly different. The adjustment dial 14 is integrally provided on the outer surface, and the operation member 3 is provided between the adjustment dial 14 and the fixed frame 1.
A spring 28 for urging and moving upward is arranged.

[0012]

When the differential screw main body 17 is operated, the operating member 3 and the printing unit 2 are moved relative to the differential screw main body 17 according to the rotation direction thereof. For example, when the differential screw main body 17 is rotated clockwise, the distance between the differential screw main body 17 and the operating member 3 is reduced, but the distance between the differential screw main body 17 and the printing unit 2 is increased. Conversely, when the differential screw main body 17 is rotated counterclockwise, the operating member 3 moves away from the differential screw main body 17 and the printing unit 2 approaches the differential screw main body 17. Therefore, the stroke change amount when the differential screw main body 17 is operated by one rotation is equal to the pitch P of the first screw 15 and the second screw 16.
Since the difference length is 1 · P2, the amount of adjustment per rotation can be reduced. For example, the pitch P1 of the first screw 15
Is 1.25 mm and the pitch P2 of the second screw 16 is 1.0 mm, the stroke change amount per rotation is 0.2.
It becomes 5 mm, and it is only 0.06 mm or more in a quarter rotation.

[0013]

According to the present invention, the stroke adjusting mechanism 4 is constituted by the differential screw 13, and the stroke change amount per one rotation of the screw 13 is the pitch difference between the first screw 15 and the second screw 16. Therefore, as compared with the conventional simple screw type adjustment mechanism, the operation stroke S can be finely adjusted more reliably, and the pressure contact force of the printing unit 2 can be adjusted and changed with high accuracy. Since the stroke is adjusted by the differential screw 13, the adjustment operation amount of the differential screw 13 with respect to the minimum adjustment amount can be increased, and the user can easily and easily press the contact force of the printing unit 2 without depending on the delicate adjustment operation. Can be changed. By reducing the pitch difference between the first screw 15 and the second screw 16, the minimum adjustment amount of the stroke S can be easily reduced. Therefore, stroke adjustment can be performed with high accuracy by the differential screw 13 processed with general processing accuracy, and a rubber stamp having a fine adjustment function can be manufactured at low cost.

[0014]

【Example】

(First Embodiment) FIGS. 2 to 7 show a first embodiment of the present invention. 2 and 3, the rubber stamp of the present invention is a rectangular box-shaped fixed frame 1 that opens downward, a printing unit 2 that is vertically movably accommodated in the fixed frame 1, and an operating member that stamps the printing unit 2. 3 and a stroke adjusting mechanism 4 that defines the operation stroke S of the printing unit 2.

The printing unit 2 comprises an inner case 8 for holding an ink occlusion body 6 and a printing body 7 made of a porous rubber layer, and a holder 9 for supporting the case 8. The inner case 8 can be slidably displaced with respect to the holder 9 in the longitudinal direction so that the ink can be replenished from the upper surface side of the inner case 8. Therefore, the inner case 8 is engaged with the joint surface of both members 8 and 9 with each other. It has matching engagement guide members 8a and 9a. Further, as shown in FIG. 4, one end of the fixed frame 1 is formed as a separate component, and the open / close frame 5 is attached to and detached from the fixed frame 1 to remove the inner case 8 from the fixed frame 1. It is supposed to be put out.

A boss 10 is provided so as to project upward at the center of the upper surface of the holder 9, and the boss 10 is projected upward from the upper surface wall of the fixed frame 1. The stroke adjusting mechanism 4 is incorporated between the boss 10 and the boss 11 projecting from the inner surface of the upper wall of the operating member 3. That is, the printing unit 2 is connected and fixed to the operation member 3 via the stroke adjusting mechanism 4.

The stroke adjusting mechanism 4 is formed by a differential screw 13 and an adjusting dial 14. In FIG. 6, the first screw 15 and the second screw 16 each of which is a right (or left) male screw, and the differential screw main body 17 that is simultaneously screwed into both the screws 15 and 16 form the differential screw 13. The support shaft 19 is press-fitted and fixed to the boss 11 of the operation member 3, and the first screw 15 is formed on the upper half of the support shaft 19. Second screw 16
Is formed on the peripheral surface of the boss 10 projecting from the holder 9. Further, the boss 10 is formed with a guide hole 20 into which the support shaft 19 is fitted, the support shaft 19 and the guide hole 20 are made to have a partial arc-shaped cross section as shown in FIG. Hold it in place.

The first screw 15 and the second screw 16 have slightly different pitches P1 and P2. In the illustrated example, the first
When the nominal diameter of the screw 15 is 8 mm and its pitch P1 is 1.25 mm, the nominal diameter of the second screw 16 is 12 mm and its pitch P2 is 1.75 mm. It is preferable that the effective lengths of both screws 15 and 16 are set to the same ratio according to the pitch ratio. Female threads are formed on the inner surface of the differential screw main body 17 having a different diameter nut shape so as to correspond to the both screws 15 and 16.

The differential screw main body 17 is located on the inner surface of the operating member 3 in the assembled state. It has an adjusting dial 14 for enabling the screw main body 17 to be operated from the outside.
The adjustment dial 14 is formed by integrally forming a disc-shaped dial base 22 and a connecting boss 23 protruding upward, and rotatably supports the dial base 22 in a hole 24 opened in the center of the upper wall of the fixed frame 1. . The connecting boss 23 is mainly a differential screw 17.
5, the differential screw main body 17 accompanies the connection boss 23 in the circumferential direction by making the cross-sectional shape of the fitting surfaces 25 of both members 23 and 17 hexagonal as shown in FIG. It is supposed to be rotatable but relatively movable in the axial direction. A brake member 26 that prevents the adjustment dial 14 from idling is provided on the joint surface between the dial base 22 and the fixed frame 1. That is, as shown in FIG. 6, continuous chevron-shaped engaging bodies 26a and 26b are formed continuously on the wall surfaces facing each other in a circular shape, and the engagement force prevents the dial base body 22 from moving in the circumferential direction.

A spring 28 is interposed between the upper end of the connecting boss 23 and the inner surface of the upper wall of the operating member 3. The spring 28, which is a compression coil spring, presses and biases the operating member 3 upward, whereby the print unit 2 is pulled up and biased via the stroke adjusting mechanism 4, and is supported in a floating manner in the fixed frame 1. ing. The spring 28 also functions to keep the above-described brake member 26 in the engagement posture at all times.

In FIG. 3, the operating member 3 is formed in the shape of a rectangular box which opens downward, and the lower end edge 29 of the operating member 3 is fixed frame 1.
The lower limit is regulated by abutting the receiving wall 30 standing on the upper wall of the. That is, the lower edge 29 and the receiving wall 3
The vertical distance from 0 is the operation stroke S by which the printing unit 2 can be moved downward, and due to the difference between this stroke S and the height h from the printing surface 7a of the printing unit 2 to the paper surface,
Characters are faint or crushed. The operation stroke S may be slightly smaller than the height h (0.0
It is often set large. The receiving wall 3
Reference numeral 0 projects upward from the upper surface of the dial base body 22.
This is to prevent the lower end edge 29 from interfering with the dial base body 22 at the time of imprinting, and to make the dial base body 2 on the operation member 3 side.
It is intended to avoid the appearance disadvantage due to the provision of the notch for allowing the 2 to escape. In FIG. 4, reference numeral 32 is a label for displaying the print content on the stamp surface 7a.

The operation of the stroke adjusting mechanism 4 will be described below. When the operation stroke S is proper, the printing unit 2 is pushed by the operation of pushing down the operation member 3 and the differential screw 1
3, the marking surface 7a is pressed against the paper surface with an appropriate pressure contact force. For example, when the character is faint, it means that the operation stroke S is insufficient, and thus the operation stroke S needs to be increased. For that purpose, the adjustment dial 14 is rotated counterclockwise as viewed from above the rubber stamp. By this operation, the differential screw main body 17 rotates, and the second screw main body 17 rotates in the screwing direction with respect to the first screw 15.
The screws 16 move in opposite directions in the loosening direction. At this time, since the pitches P1 and P2 of the first screw 15 and the second screw 16 are 1.25 mm and 1.75 mm, respectively, the movement amount of the first screw 15 is offset and the second screw 16 is offset.
Of the movement amount of the operation member 3 corresponding to the pitch difference.
And the distance between the printing units 2 increases. In fact, since the operating member 3 is always pushed up and biased by the spring 28, the lowering movement of the printing unit 2 is absorbed by the operating member 3, the differential screw 13, and the entire printing unit 2 being pushed up, and as a result. The operation stroke S increases.

Therefore, for example, when the adjusting dial 14 is rotated by a quarter, the pitch difference is a quarter of 0.5 mm, that is, 0.125.
The operation stroke S is expanded by mm, and the stamp surface 7a is correspondingly expanded.
A strong pressing force can be applied to. When the character is crushed, the operation stroke S is too large, and therefore the operation stroke S may be shortened by rotating the adjustment dial 14 in the opposite direction to the above case.

(Second Embodiment) FIGS. 8 to 10 show a second embodiment of the present invention. In this, the first screw 15 is attached to the support shaft 1
9 and the second screw 16 is a hexagonal nut 38
The differential screw main body 17 is provided between the nut 38 and the support shaft 19. The nut 38 is guided and supported by a guide boss 39 provided upright on the upper surface of the fixed frame 1 so as to be vertically movable only. Therefore, when the differential screw main body 17 is screwed into the first screw 15, the nut 3 is moved in the direction opposite to the screwing direction.
8 moves. The adjusting dial 14 is the guide boss 39.
Is mounted in a state of being externally fitted to the differential screw main body 17 through a fitting surface 25 having a hexagonal cross section at its upper end.
In this case, the lower surface of the nut 38 contacts the bottom wall 40 of the guide boss 39 to regulate the downward movement of the operating member 3. Further, even when the nut 38 moves relative to the differential screw main body 17 and, in some cases, the differential screw main body 17 relative to the support shaft 19, the vertical distance between the operating member 3 and the fixed frame 1 becomes constant. .

(Third Embodiment) FIG. 11 shows a third embodiment of the present invention. In this case, the first screw 15 is formed as a separate component and is externally fitted and fixed to the boss 11 of the operation member 3, the support shaft 19 is fixed to the boss 10 of the holder 9, and the second screw 16 is formed on the peripheral surface thereof. At the same time, the differential screw main body 17 is slidably guided by the guide boss 33 provided upright from the fixed frame 1.

(Fourth Embodiment) FIG. 12 shows a fourth embodiment of the present invention. This is one in which the stroke adjusting mechanism 4 is constructed by a differential screw structure which is almost the same as that of the first embodiment, but the adjusting dial 14 is omitted and the operating member 3 is supported by the support shaft 19.
The difference lies in that the differential screw main body 17 is directly rotated to perform an adjusting operation. The operation member 3 is held by a frame 34 that is erected on the fixed frame 1 so as not to rotate.

(Fifth Embodiment) FIG. 13 shows a fifth embodiment of the present invention. In this case, the first screw 15 and the second screw 16 which are female screws are formed on each of the boss 11 on the inner surface of the operation member 3 and the boss 10 of the holder 9, and the support shaft 19 which is simultaneously screwed into both the screws 15 and 16 is provided. The main body 17 is a differential screw.

(Sixth Embodiment) FIG. 14 shows a sixth embodiment of the present invention. In this case, the bosses 11 and 10 provided on the operation member 3 and the printing unit 2, respectively, are provided with the first screw 15 and the second screw 16 which are male screws, and the spindle 19 having a non-circular cross section is fixed to the boss 10 on the holder 9 side. In addition, the upper part thereof is slidably fitted into the boss 11 on the operation member 3 side. Further, the operating member 3 is divided into the peripheral frame 35 and the ceiling wall 36, and the first screw 15 provided on the boss 11 can be easily molded with the split mold.

(Another embodiment) In addition to the above, the spring 28 does not necessarily have to be a coil spring, and can be replaced with a metal plate spring or a plastic molded spring. The differential screw 13 may be formed by a left-hand screw, and the pitch difference may be such that the first screw 15 side has a large pitch. The printing unit 2 does not necessarily have to have a form in which the inner case 8 is separated from the holder 9, and, for example, ink replenishment is performed on the printing surface 7
When performing from the a side, the inner case 8 and the holder 9
And may be integrated.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view for explaining in principle the structure of a rubber stamp according to the present invention.

FIG. 2 is a perspective view of a rubber stamp.

FIG. 3 is a vertical sectional side view.

FIG. 4 is a vertical sectional front view.

5 is a cross-sectional view taken along the line AA in FIG.

FIG. 6 is an exploded perspective view of an adjusting mechanism.

FIG. 7 is a cross-sectional view showing a state where the printing unit is being separated.

FIG. 8 is a vertical side view of the second embodiment.

9 is a sectional view taken along line BB in FIG.

10 is a sectional view taken along the line CC in FIG.

FIG. 11 is a vertical sectional side view of the third embodiment.

FIG. 12 is a vertical sectional side view of a fourth embodiment.

FIG. 13 is a vertical sectional side view of the fifth embodiment.

FIG. 14 is a vertical sectional side view of a sixth embodiment.

[Explanation of symbols]

 1 Fixed Frame 2 Printing Unit 3 Operating Member 4 Stroke Adjusting Mechanism 9 Holder 13 Differential Screw 14 Adjustment Dial 15 First Screw 16 Second Screw 17 Differential Screw Main Body 19 Spindle 38 Nut 39 Guide Boss S Operating Stroke

Claims (6)

[Claims] 1. A fixed frame (1), a printing unit (2) housed in the fixed frame (1) so as to be vertically movable, and an operating member (3) for impressing the printing unit (2). The operating member (3) and the printing unit (2). Between the printing unit 2
Is a rubber stamp provided with a stroke adjusting mechanism 4 composed of a differential screw 13 that defines the operation stroke S of the printing unit 2 and the operating member 3, and the support shaft 19 fixed to the inner surface of the operating member 3 and the printing unit 2. The protrusion 2 is provided on the upper surface of the unit 2 and is connected to a boss 10 which is fitted onto the support shaft 19 so as to be vertically movable relative to each other. A differential screw 13 is formed on the upper peripheral surface of the support shaft 19. A first screw 15 and a second screw 16 formed on the peripheral surface of the boss 10,
It consists of a tubular differential screw main body 17 that is screwed into both screws 15 and 16 at the same time, and both screws 15 and 16 are formed so as to have a slightly different screw pitch. Between the differential screw main 1
A rubber stamp provided with an adjusting dial 14 for rotating 7 and a spring 28 for urging and moving the operating member 3 upward is arranged between the adjusting dial 14 and the operating member 3. 2. A fixed frame (1), a printing unit (2) vertically movably housed in the fixed frame (1), and an operating member (3) for impressing the printing unit (2), the operating member (3) and the printing unit (2). Between the printing unit 2
A rubber stamp provided with a stroke adjusting mechanism 4 including a differential screw 13 for defining the operation stroke S of the operating member 3 and the printing unit 2 are connected to each other via a support shaft 19 so as to be vertically movable together. The differential screw 13 is the first screw 1 formed on the peripheral surface of the support shaft 19.
5, and a cylindrical differential screw main body 17 that is screwed into the first screw 15
And the second screw 1 that is screwed with the male screw on the peripheral surface of the differential screw 17.
The nut 38 is provided with 6 and both screws 15 and 16 are formed so that the screw pitches are slightly different. The nut 38 is provided on the upper surface of the fixed frame 1 so as to stand upright on the guide boss 3.
It is internally fitted and supported only by vertical movement by means of 9, and the differential screw main body 1 is provided between the differential screw main body 17 and the fixed frame 1.
A rubber stamp provided with an adjusting dial 14 for rotating 7 and a spring 28 for urging and moving the operating member 3 upward is arranged between the adjusting dial 14 and the operating member 3. 3. A fixed frame (1), a printing unit (2) housed in the fixed frame (1) so as to be vertically movable, and an operating member (3) for impressing the printing unit (2). The operating member (3) and the printing unit (2). Between the printing unit 2
Is a rubber stamp provided with a stroke adjusting mechanism 4 including a differential screw 13 that defines the operation stroke S of the printing unit 2 and the operating member 3. The protrusion 3 is provided on the inner surface of the member 3 and is connected to the support shaft 19 by a boss 11 which is fitted externally so as to be vertically movable relative to each other. A differential screw 13 is formed on the lower peripheral surface of the support shaft 19. A second screw 16, a first screw 15 provided around the boss 11, and a tubular differential screw main body 1 that is simultaneously screwed into both screws 15 and 16.
7, the two screws 15 and 16 are formed such that the screw pitches thereof are slightly different, and between the differential screw main body 17 and the fixed frame 1, the differential screw main body 1
A rubber stamp provided with an adjusting dial 14 for rotating 7 and a spring 28 for urging and moving the operating member 3 upward is arranged between the adjusting dial 14 and the operating member 3. 4. A fixed frame (1), a printing unit (2) housed in the fixed frame (1) so as to be vertically movable, and an operating member (3) for impressing the printing unit (2). The operating member (3) and the printing unit (2). Between the printing unit 2
Is a rubber stamp provided with a stroke adjusting mechanism 4 including a differential screw 13 that defines the operation stroke S of the differential screw 13. The differential screw 13 is formed on the peripheral surface of a boss 10 projecting from the upper surface of the printing unit 2. The second screw 16 and the second screw 16
Cylindrical differential screw main body 17 and a differential screw main body 1
The first screw 15 screwed into the female screw on the inner surface of the upper part of 7 and the support shaft 19 formed on the peripheral surface, both screws 15 and 16 are formed so that the screw pitch is slightly different. The lower part of the print unit 2 is supported by the boss 10 so as to be vertically movable only. The print unit 2 is urged to move upward between the differential screw main body 17 and the fixed frame 1 via the stroke adjusting mechanism 4. A rubber stamp in which a spring 28 is disposed, and the operating member 3 is detachably fitted on the upper end of the support shaft 19. 5. A fixed frame (1), a printing unit (2) vertically movably housed in the fixed frame (1), and an operating member (3) for impressing the printing unit (2) are provided. The operating member (3) and the printing unit (2). Between the printing unit 2
Is a rubber stamp provided with a stroke adjusting mechanism 4 including a differential screw 13 that defines the operation stroke S of the bosses 10 and 11 on the upper and lower facing surfaces of the printing unit 2 and the operating member 3, respectively. A differential screw 13 having a first screw 15 formed on the inner surface of the boss 11 and a second screw 16 formed on the inner surface of the boss 10.
It consists of a rod-shaped differential screw main body 17 that is screwed into both screws 15 and 16 at the same time. Both screws 15 and 16 are formed so that the screw pitches are slightly different, and they are fixed in the middle of the differential screw main body 17. Adjustment dial 14
A rubber stamp in which a spring 28 for urging the operation member 3 upward is arranged between the fixed frame 1 and the fixed frame 1. 6. A fixed frame (1), a print unit (2) housed in the fixed frame (1) so as to be vertically movable, and an operation member (3) for impressing the print unit (2), the operation member (3) and the print unit (2). Between the printing unit 2
Is a rubber stamp provided with a stroke adjusting mechanism 4 composed of a differential screw 13 for defining the operation stroke S of the printing unit 2 and the operating member 3, which are fitted and fixed to the boss 10 on the upper surface of the printing unit 2. The shaft 19 is connected to a boss 11 that is provided on the inner surface of the operating member 3 so as to project and is fitted to the support shaft 19 so as to be vertically movable relative to each other. The first screw 15 and the second screw 16 respectively formed on the peripheral surface of 10, and the tubular differential screw main body 1 that is screwed into both screws 15 and 16 at the same time.
7, the screws 15 and 16 are formed so that the screw pitches thereof are slightly different, and the adjustment dial 14 is integrally provided on the outer surface of the differential screw main body 17, and the adjustment dial 14 and the fixed frame 1 are A rubber stamp in which a spring 28 for urging the operation member 3 upward is arranged between the two.