JP3464065B2 - Pad printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad printing machine, and more specifically, it is movably supported in a front-back direction with respect to a frame, and ink forming a print pattern adhered to the surface is pressed against a work at a forward position to transfer the ink. The present invention relates to a pad printer having a transfer pad for printing.

[0002]

2. Description of the Related Art Conventionally, a pad printing machine of this type has a slider provided on a guide rod provided on a frame so as to be movable back and forth, as disclosed in, for example, Japanese Utility Model Publication No. 3-14360. In addition, a transfer pad is attached to the slider so as to be vertically movable, and a cylinder for moving the slider back and forth is provided.
Then, first, the transfer pad is retracted to the retracted position by the cylinder, the ink applied to the printing plate is transferred to the surface of the transfer pad at the retracted position, and then the transfer pad is moved to the advanced position by the cylinder. Then, at this forward position, the ink constituting the print pattern attached to the surface of the transfer pad is pressed against the work to perform the transfer printing.

[0003]

However, in the above-mentioned conventional pad printing machine, when the transfer pad is stopped at the forward position or the backward position, the slider is brought into contact with the stopper provided on the frame side and stopped. It is configured to be stopped by moving the piston or moving the piston until it abuts against the inner wall surface of the cylinder chamber. Therefore, due to the impact of the slider abutting against the stopper or the piston abutting against the inner wall surface of the cylinder chamber, the soft transfer pad quivers and the ink constituting the print pattern transferred to the surface thereof is shaken. When the ink is transferred from the transfer pad to the work, the print pattern is distorted or bleeding. This is especially true when the size of the printing machine is increased, so that the stroke of the transfer pad becomes large and the inertial force becomes large, so that the impact at the time of stop becomes large and the problems such as the above-mentioned distortion and bleeding of the print pattern occur. In addition, when the transfer pad speed is increased in the front-back direction to speed up transfer printing, the impact at the time of stop will increase with the speeding up. There is a problem that the pattern is distorted or bleeding. As a result, there is a problem that the printing machine cannot be upsized and the transfer printing cannot be speeded up.

Although the above problem can be solved by using a servo cylinder for controlling the movement of the cylinder, the servo cylinder requires a very complicated control mechanism and is expensive.

The present invention addresses the above-mentioned situation in the prior art. Even without using an expensive servo cylinder, it is possible to suppress the impact when the transfer pad is moved to the forward position or the backward position and stop the transfer pad. It is an object of the present invention to eliminate the distortion and bleeding of a print pattern due to the blurring of the adhered ink, thereby making it possible to increase the size and speed of transfer printing.

[0006]

In order to achieve the above object, the present invention is characterized in that it is configured as follows.

First, the invention according to claim 1 of the present application (hereinafter,
The first invention) is a slider provided on a guide rod arranged on a frame so as to be movable back and forth, and an ink, which is supported by the slider and constitutes a print pattern attached to the surface, at a forward position. A pad printing machine comprising: a transfer pad that is pressed against and prints on a sheet; and a cylinder that moves the slider back and forth, wherein an endless body is wound around a pair of rotating wheels between the front and rear portions of the frame. In addition to providing a transmission mechanism, the endless body of the winding transmission mechanism is rotatably coupled to the slider in association with the movement of the slider, while the endless body is provided with a detection unit and is accompanied by the movement of the endless body. At the front position of the forward end and the backward end of the detection unit, a detector for detecting the detection unit is provided, and
A braking mechanism is provided to apply a load to the rotation of the endless body based on the detection signals output from these detectors to brake the forward and backward movement of the slider by the cylinder.

The invention according to claim 2 (hereinafter referred to as the second invention) is, in the first invention, a projection projecting outward from an endless body as the detection part, and a projection when the projection passes through. A variable resistor having a detection lever that engages with the protrusion and swings is used, and an electromagnetic brake whose braking force is controlled based on a detection signal output from the variable resistor is used as a braking mechanism. Characterize.

[0009]

According to the above-mentioned structure, the following actions can be obtained.

According to the first aspect of the invention, when the slider moves from the retracted position to the advanced position, the endless body of the winding transmission mechanism rotates in association with the movement of the slider, and the slider moves to a position before the advanced position. When it is located at, the detector provided on the endless body is detected by a detector provided at a position before the forward end of the detector, and a detection signal is output from the detector to the braking mechanism. Based on this detection signal, the braking mechanism applies a load to the rotation of the endless body to provide braking to the forward movement of the slider by the cylinder. As a result, the slider is decelerated from a position before the forward position to, for example, the forward position where it abuts on the front stopper, and when the slider comes into contact with the front stopper and stops, almost impact is generated on the slider. It is possible to stop without.
As a result, the impact of the slider colliding with the stopper causes
It is possible to prevent the soft transfer pad from trembling and causing the ink transferred on the surface to shake and become distorted, which may cause distortion or bleeding when transfer printing is performed on the work from the transfer pad. It is possible to prevent this. Therefore, it is possible to increase the size of the printing machine and increase the transfer printing speed, and it is not necessary to use an expensive servo cylinder, so that the cost can be suppressed.

Further, when the slider is moved from the forward movement position to the backward movement position and the slider is positioned at the front position of the forward movement position, the detection unit provided on the endless body is moved to the front position of the backward movement end of the detection unit. Detected by the detector provided, the braking mechanism is actuated by the same action as in the case of the forward end side detector described above, and a braking force is applied to the backward movement of the slider,
The moving speed of the slider is decelerated from before the retracted position to the retracted position where it abuts the rear stopper, and when the slider abuts the rear stopper, the slider retreats with almost no impact on the slider. It is possible to stop at the position.

According to the second aspect of the invention, the detection portion is a protrusion protruding outward from the endless body, and the detector is provided with a detection lever which engages with the protrusion and swings when the protrusion passes. Since the variable resistor is an electromagnetic brake in which the braking mechanism controls the braking force based on the detection signal output from the variable resistor, when the slider is moved to the forward position, the slider is in front of the forward position. At the position, the projection provided on the endless body of the winding transmission mechanism hits the detection lever of the one variable resistor, and the lever is swung. Due to this swing, a detection signal is output from the variable resistor to the electromagnetic brake, and a load is applied to the rotation of the endless body by the brake, and braking is applied to the forward movement of the slider by the cylinder. At this time, the braking force is increased by increasing the voltage to the electromagnetic brake in accordance with the swing amount of the lever, and a large load is gradually applied to the rotation of the endless body to smoothly reduce the moving speed of the slider. It will be possible. As a result, the slider is smoothly decelerated by a short braking distance before it comes into contact with the front stopper, and when the slider comes into contact with the stopper, for example, it can be stopped at the forward position with almost no impact on the slider. Is possible. As a result, it is possible to suppress the shock when the slider is stopped, transfer the print pattern from the transfer pad to the work without causing distortion or bleeding, and to decelerate smoothly with a short braking distance. It is possible to further speed up transfer printing.

On the other hand, when the slider is retracted, the other variable resistor applies a braking force to the movement of the slider by the electromagnetic brake in the same manner as in the case of the one variable resistor described above, and the slider contacts the rear stopper. By the time it hits, it is possible to sufficiently reduce the moving speed of both sliders and stop the sliders in the retracted position without giving an impact to the sliders.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 5, the pad printing machine 1 of the present invention has a case-shaped frame 3 which is installed on a pedestal 2 and which projects forward and which has a substantially inverted L shape in a side view. In the frame 3, a front support plate 4 is erected on the front part thereof, and a rear support plate 5 is erected on the rear part thereof, and a pair of guide rods are provided between the front and rear support plates 4, 5. 6, 6 are erected, and the first and second sliders 7, 8 are independently supported on the guide rods 6, 6 so as to be movable in the front-rear direction.

The first slider 7 is arranged in front of the second slider, and the first slider 7 has a first support shaft 9 and a pair of guides, as shown in FIGS. The rods 10, 10 are respectively hung down, and the support shaft 10 and the lower portions of the guide rods 10, 10 are connected by a connecting plate 10a, and a soft transfer pad 11 mainly made of silicon rubber is attached via the connecting plate 10a. There is. As shown in FIGS. 1 and 5, the second slider 8 has a second support shaft 12 at the front thereof and a pair of guide rods 12a,
12a respectively hang down, and a doctor blade 15 is attached to the lower part of the second support shaft 12 and the guide rods 12a, 12a via a connecting plate 12b, while a pair of third support shafts 13 is provided at the rear part thereof. , 13 are hung down, and an ink plate 16 is attached to the lower portions of the third support shafts 13, 13 via a connecting plate 13a. Further, below the doctor blade 15 and the ink plate 16, there is installed a printing plate 17 in the front part and an ink tray 18 having an ink reservoir 18a in the rear part, and the front side of the ink tray 18 is provided. Is provided with a mounting table 19 for the work W.

Then, on the rear wall of the first slider 7,
The mounting piece 20 hangs down, and the mounting piece 20 is connected to a piston rod 22 of a cylinder 21 for front-back movement provided on the rear support plate 5. Therefore, the operation of the cylinder 21 causes the first slider 7, that is, the transfer pad 11, to be located above the printing plate 17 in the retracted position shown in FIG. 1 and above the workpiece W in the advanced position shown in FIG. It is reciprocated between and.

Further, a first elevating cylinder 23 for elevating the transfer pad, which uses the first supporting shaft 9 as a piston rod, is provided in the central portion of the first slider 7, and the cylinder 23 together with the first supporting shaft 9 serves to lift the transfer pad. By moving the guide rods 10 and 10 up and down with respect to the first slider 7, the transfer pad 1
1 is moved up and down at a position above the printing plate 17 (retracted position) and above the work W (advanced position). Further, as shown in FIGS. 1 and 5, at the center of the front part of the second slider 8, there is provided a second lifting cylinder 24 for lifting the doctor blade which uses the second support shaft 12 as a piston rod, and at the center of the rear part. The third support shafts 13, 1
Ink plate lifting / lowering third cylinder 2 for lifting / lowering 3 through the upper connecting rod 13b for connecting the above
5, the doctor blade 15 passes above the printing plate 17 when moving forward by the operation of the second elevating cylinder 24, and moves slightly downward when moving backward so that the front end slides on the upper surface of the printing plate 17. ing. Further, the ink plate 16 moves from the inside of the ink reservoir portion 18a at the rear portion of the ink tray 18 at the bottom of the ink tray 18 and the printing plate 1 at the time of forward movement.
It is designed to move along the upper surface of 7.

The front support plate 4 has a structure shown in FIG.
1, a front stopper 4a for stopping the first slider 7 at the forward position above the work is provided, and the rear support plate 5 is provided with a second slider 8 as shown in FIG. A rear stopper 5a for stopping at the retracted position above the reservoir 18a is provided. Further, on the side surface of the frame 3, as shown in FIGS. 1, 4 and 5, adjustment members 26, 26 such as limit switches for setting the amount of downward movement of the transfer pad 11 at the retracted position and the advanced position, and the doctor. An adjusting member 27 such as a cam that adjusts a sliding contact range with the printing plate 17 when the blade 15 moves backward, and an adjusting member 28 such as a cam that adjusts the amount of downward movement of the ink plate 16 when the ink plate 16 moves forward. An operation panel 29 on which various operation members are arranged is provided on the side surface of the frame 3.

As shown in FIGS. 1 to 4, a pair of large-diameter timing pulleys 31 and 32 are provided at a position above one side in the frame 3 and between the front and rear portions of the frame 3, and a timing belt 33 is provided. The first winding transmission mechanism 30 and the pair of small-diameter timing pulleys 4
A first winding transmission mechanism 40 in which a timing belt 43 is attached to the first and the second 42 is provided. These first and second
The large and small diameter pulleys 31 and 41 on the front side of the winding transmission mechanisms 30 and 40 are integrally coupled, and the timing pulleys 31 and 41 on the large and small diameters are supported so as to rotate integrally, and the large and small diameters on the rear side are formed. Timing pulley 32,
42 are independently supported. This allows
The timing belt 43 of the second winding transmission mechanism 40 rotates together with the rotation of the timing belt 33 of the first winding transmission mechanism 30, and the peripheral speed of the timing belt 43 changes in the first winding transmission mechanism 40. It is slower than the peripheral speed of the timing belt 33. Then, the timing belt 33 of the first winding transmission mechanism 30.
To the timing belt 43 of the second winding transmission mechanism 40, and the second slider 7 is connected to the first slider 7 via a connecting rod 35 projecting upward from the slider.
Are linked so as to be interlockable with each other via a connecting rod 45 protruding upward from the slider 8. Further, when connecting them, the positional relationship between the first slider 7 and the second slider 8 is such that the first slider 7 and the second slider 8 are in the retracted position by the cylinder 1.
The slider 8 and the slider 8 are closely contacted with each other, and the first slider 7 and the second slider 8 are set apart from each other at the forward position.

In the above embodiment, the belt transmission mechanism including the toothed pulley and the toothed belt is used as the first and second winding transmission mechanisms 30 and 40. However, instead of this, for example, a flat belt is simply used. The belt transmission mechanism may be made up of, or a chain transmission mechanism or the like may be used.

A braking mechanism 50 is provided for preventing an impact when the first and second sliders 7, 8 are stopped from moving back and forth by the cylinder 21.

In this braking mechanism 50, as shown in FIG. 1, a brake disc 51 is integrally provided on the rotary shaft 34 of the rear side timing pulley 32 of the first winding transmission mechanism 30, and the rotation of the disc 51 is prevented. An electromagnetic brake 52 is provided to brake the forward and backward movement of the first and second sliders 7 and 8 by applying a braking force. As a control means of the electromagnetic brake 52, as shown in FIGS.
A protrusion 53 for detection is provided on the upper surface of the timing belt 33 of the winding transmission mechanism 30 on the upper side, and
The detection lever 55 that comes into contact with the forward end and the backward end of the protrusion 53 due to the movement of 3 when the protrusion 53 passes.
Variable resistors 55 and 56 having a and 56a are provided, respectively, and the electromagnetic brake 52 is controlled based on the detection signals output from the variable resistors 55 and 56. In this case, the detection levers 55a and 56a of the variable resistors 55 and 56 are swingably supported, and
The timing belt 3 is normally operated by a return spring (not shown).
3, the detection levers 55a, 5
6a swings when the projection 53 hits, and when the levers 55a and 56a swing, the voltage to the electromagnetic brake 52 is increased according to the swing amount to gradually increase the braking force, while the sliders 7 , 8 is in contact with the stoppers 4a, 5a, the voltage to the electromagnetic brake 52 from a position just before the maximum swing position of the detection levers 55a, 56a is reduced, and the electromagnetic brake is released at the maximum swing position of the detection lever 56a. The voltage applied to 52 is zero, and braking by the brake 52 is released.

In addition to using the variable resistors 55 and 56 described above as the control means of the electromagnetic brake 52, for example, a detection body is appropriately provided on the timing belt side, and a limit switch for detecting the detection body or a non-contact type is used. The electromagnetic brake may be controlled by using a plurality of detection sensors and turning on or off these switches or sensors.

Next, the operation when transfer printing is performed on the work W using the pad printing machine will be described.

First, in the state shown in FIGS. 1 and 2, the transfer pad 11 is provided on the printing plate 17 by being moved downward by the first elevating cylinder 23 and pressed against the upper surface of the printing plate 17 located below. The ink in the recessed groove is transferred to the transfer pad 11. Next, the transfer pad 11 is the first
After being moved up to the original position by the elevating cylinder 23, the first slider 7 is moved forward by the front-rear moving cylinder 21 to move the transfer pad 11 to the position above the work W, and again at this position the first slider 7 is moved to the first position. The pad 1 is moved downward by the lifting cylinder 23 and pressed against the work W.
The ink transferred to No. 1 is transferred and printed on the work W.

When the first slider 7 moves forward, the connecting rod 35 provided on the first slider 7 causes the first slider 7 to move to the first position.
The timing belt 33 of the winding transmission mechanism 30 is pushed forward and rotated. As a result, the large-diameter timing pulley 31 on the front side of the first winding transmission mechanism 30 is rotated, and the small-diameter timing pulley 41 on the front side of the second winding transmission mechanism 40, which is integrally connected to the pulley 31, is simultaneously rotated. When rotated, the timing belt 43 in the second winding transmission mechanism 40 is also rotated. Due to the rotation of the timing belt 43, the second slider 8 is pulled through the connecting rod 45 and moved forward.

In this case, since the diameter of the timing pulley 41 of the second winding transmission mechanism 40 is smaller than the diameter of the timing pulley 41 of the first winding transmission mechanism 30, the timing belt of the second winding transmission mechanism 40 is formed. 43 is the first winding transmission mechanism 3
It is rotated at a peripheral speed lower than that of the timing belt 33 of 0. As a result, the stroke of the first slider 7 becomes larger than the stroke of the second slider 8, and as a result, the second slider 8 is moved forward to move the doctor blade 15 and the ink plate 16 from the rear position to the front position of the ink tray 18. The transfer pad 11 can be moved longer than its moving distance while moving up to. That is, in the retracted position as shown in FIG. 1, the distance a is between the transfer pad 11 and the doctor blade 15, whereas in the advanced position the transfer pad 11 and the doctor blade 15 are separated from each other as shown in FIG. The space A becomes large, and the transfer pad 11
Can be positioned at a position away from the doctor blade 15 in the forward direction. As a result, transfer printing can be performed on a large work W without being restricted by the front-back length of the ink tray 18.

The work W by the transfer pad 11 is also used.
After the printing on the transfer pad 11 is completed, the transfer pad 11 is returned to the upper position of the work W by the first elevating cylinder 23, and then the first slider 7 moves the printing plate 17 by the cylinder 21.
Move to the retracted position above the position. At this time, as the first slider 7 retreats, the first and second winding transmission mechanisms 3
The second slider 8 also retracts via 0, 40. Also in this case, the second slider 8 is rotated at a peripheral speed lower than that of the timing belt 33 of the first winding transmission mechanism 30.
Since it is moved by the timing belt 43 of the winding transmission mechanism 40, at the retracted position, the first slider 7 and the second slider 8 are moved backward so as to closely contact each other as shown in FIG. .

When the second slider 8 moves forward, ink is applied to the printing plate 17 by the ink plate 16, and when the second slider 8 moves backward, the doctor blade 15 is moved down a little, so that the tip of the blade 15 moves. Stamped 1
It is slidably contacted with the upper surface of the printing plate 7, and excess ink on the printing plate 17 is removed.

When the first and second sliders 7 and 8 are stopped by the cylinder 21 at the forward and backward positions, the braking mechanism 50 is provided so that the sliders 7 and 8 can be moved. Stoppers 4a, 5a
The impact due to the contact with the will be alleviated.

In this case, as shown in FIG. 7, for example, when the first slider 7 is moving forward, the first winding transmission mechanism 30 is located in front of the forward position where the first slider 7 hits the front stopper 4a and stops. The projection 53 provided on the timing belt 33 hits the detection lever 56a of the variable resistor 56 on the rear side of the frame, and the lever 56a is swung to the position shown by the phantom line in FIG. Due to this swing, a detection signal is output from the variable resistor 56 to the electromagnetic brake 52, and the brake 52 applies resistance to the brake disk 51 to perform braking. At this time, the detection signal corresponding to the swing amount of the lever 56a is sent to the variable resistor 5
6 to the electromagnetic brake 52, and the electromagnetic brake 52
The braking force is increased by increasing the voltage applied to the detection lever 56a in accordance with the swing amount of the detection lever 56a, and the resistance is gradually applied to the disk 51 to smoothly reduce the moving speed of the timing belt 33. As a result, the first and second sliders 7 and 8 are
Can be smoothly decelerated with a short braking distance, and when the first slider 7 comes into contact with the stopper 4a, the first and second sliders 7 and 8 are stopped at the forward position with almost no impact. It becomes possible. As a result, the impact caused by the collision of the first slider 7 with the stopper 4a causes the soft transfer pad 11 to quiver, causing the ink transferred onto the surface to bleed, causing distortion when transfer printing is performed on the work W. Can be prevented. In particular,
In a large-sized printing machine, the stroke becomes large and the inertial force becomes large, and the problem due to the ink bleeding due to the above-mentioned impact becomes conspicuous, but in the present invention, such a problem can be solved and an expensive servo cylinder is used. Even if it is not used, it is possible to smoothly decelerate with a short braking distance to increase the speed, and it is possible to reduce the cost.

Further, the voltage to the electromagnetic brake 52 from a position just before the maximum swing position of the detection lever 56a in the variable resistor 56 is reduced, and the voltage to the electromagnetic brake 52 is reduced to the maximum swing position of the detection lever 56a. The voltage becomes zero and the braking by the brake 52 is released. This allows the sliders 7 and 8 to move backward by the cylinder 21. Further, the detection lever 56a is returned to the original position shown by the solid line in FIG. 7 by a return spring (not shown) as the protrusion 53 moves in the separating direction.
The electromagnetic brake 52 does not operate during the return movement to the original position.

On the other hand, when the first slider 7 is retracted,
The variable resistor 55 located on the front side of the frame applies a braking force to the movement of the sliders 7 and 8 by the electromagnetic brake 52 by the same operation as that of the variable resistor 56 on the rear side of the frame, and the second slider 8 It is possible to sufficiently reduce the moving speed of both sliders 7 and 8 by the time of contacting the rear stopper 5a, and stop the second slider 8 in the retracted position without giving an impact to the second slider 8. .

In the above embodiments, the first slider 7 is provided with the cylinder 21 for moving back and forth, but the cylinder 21 is provided on the second slider 8 instead of the first slider 7. Of course, it is also good.

[0036]

As described above, according to the first aspect of the present invention, when the slider is moved to the forward position or the backward position, the endless body of the winding transmission mechanism is rotated in association with the movement of the slider, and the slider is moved. Is located at the front position of the forward movement position or the reverse movement position, the detection unit provided on the endless body of the winding transmission mechanism that rotates in conjunction with the movement of the slider is located at the front position between the forward movement end and the backward movement end of the detection unit. Is detected by one of the detectors respectively provided in the, and a detection signal is output from the detector to the braking mechanism, and the braking mechanism applies a load to the rotation of the endless body to brake the slider back and forth movement by the cylinder. Will be given. As a result, the slider is decelerated from a position before the forward or backward position to a forward position or a backward position where it abuts the stopper, and when the slider comes into contact with the stopper and stops, It is possible to stop at the forward drive position or the reverse drive position with almost no impact. As a result, it is possible to prevent the soft transfer pad from trembling due to an impact when the slider is stopped at the forward position or the reverse position, and the ink transferred to the surface of the soft transfer pad is shaken and becomes distorted. Accordingly, it is possible to prevent the print pattern from being distorted or bleeding when transfer printing is performed on the work from the transfer pad. Therefore, it is possible to increase the size and speed of transfer printing without using an expensive servo cylinder, and it is possible to reduce the cost.

According to the second aspect of the invention, the detection portion is a protrusion protruding outward from the endless body, and the detector is provided with a detection lever that engages with the protrusion and swings when the protrusion passes. Since the variable resistor is the electromagnetic brake in which the braking mechanism controls the braking force based on the detection signal output from the variable resistor, when the slider is positioned at the front position of the forward movement position or the backward movement position, The projection provided on the endless body of the latching mechanism hits the detection lever of one variable resistor to swing the lever, and this swing causes a detection signal to be output from the variable resistor to the electromagnetic brake for braking by the brake. Will be done. At this time, the braking force by the electromagnetic brake can be controlled according to the swing amount of the lever,
As a result, a large load is gradually applied to the rotation of the endless body, and the moving speed of the cylinder can be smoothly decelerated. As a result, the slider can be smoothly decelerated over a short braking distance, and when the slider contacts the stopper, it can be stopped at the forward position with almost no impact on the slider. As a result, it is possible to transfer the print pattern from the transfer pad without causing distortion or bleeding on the work by suppressing the impact when the slider is stopped, and to smoothly decelerate with a short braking distance. It is possible to speed up transfer printing.

[Brief description of drawings]

FIG. 1 is an enlarged vertical side view of a main part of a pad printing machine according to the present invention.

FIG. 2 is a schematic side view of the pad printing machine.

FIG. 3 is an enlarged and enlarged vertical side view showing a state in which the transfer pad is moved to a forward position.

FIG. 4 is a sectional view taken along line XX of FIG.

5 is a sectional view taken along line YY of FIG.

FIG. 6 is a sectional view taken along line ZZ of FIG.

FIG. 7 is an enlarged front view of the variable resistor.

[Explanation of symbols]

1 printing machine 3 frames 6,6 guide rod 7 slider 11 Transfer pad 21 cylinders 30 winding transmission mechanism 31,32 Large diameter timing pulley (rotating wheel) 33 Timing belt (endless body) 50 braking mechanism 52 Electromagnetic brake 53 Protrusion (detection unit) 55,56 Variable resistor (detector) 55a, 56a Detection lever W work

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Claims (2)

(57) [Claims] 1. A slider provided on a guide rod arranged on a frame so as to be movable back and forth, and ink, which is supported by the slider and constitutes a print pattern, is pressed against a work at a forward position. A pad printing machine comprising a transfer pad for transfer printing by means of a transfer and a cylinder for moving the slider back and forth, wherein a winding transmission mechanism in which an endless body is hung on a pair of rotating wheels between the front and rear parts of the frame. And the endless body of the winding transmission mechanism is rotatably connected to the slider in association with the movement of the slider, while the endless body is provided with a detection unit, and Detectors for detecting the detection unit are provided at the front positions of the forward end and the backward end of the detection unit according to the movement of the endless body, and the endless body is detected based on the detection signals output from these detectors. A pad printing machine is provided with a braking mechanism for applying a load to the rotation of the slider to brake the forward and backward movement of the slider by the cylinder. 2. The braking device is a variable resistor having a detection lever, which is a protrusion protruding outward from an endless body, and a detector having a detection lever which engages with the protrusion and swings when the protrusion passes. The pad printing machine according to claim 1, wherein the mechanism is an electromagnetic brake whose braking force is controlled based on a detection signal output from the variable resistor.