JPS6217256Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pressurizing device used in press-type stencil printing, etc., and specifically, a pressurizing device equipped with a safety device to prevent hands, fingers, etc. from being squeezed by the pressurizing part. Related to equipment.

A press-type stencil printing device is known in which printing is performed by pressing a pressure pad to which a stencil paper is attached onto printing paper placed on a pressure-receiving surface of a base using power generated by a drive source device such as an electric motor. It is being In this type of stencil printing device, a printing pressure of around 0.2 kg/cm ² is required to obtain a good printed image.
Therefore, depending on the size of the stamp surface, a considerably large force is applied between the pressure pad and the pressure receiving surface, and it is dangerous if hands, fingers, etc. are caught there.

In printing operations using a press-type stencil printing device such as the one described above, it is necessary to insert one's hands or fingers to set the stencil paper, printing paper, masking sheet, etc. between the pressure pad and the pressure-receiving surface. There is a lot of work to be done, and there is therefore a high risk that the drive source device will be activated by mistake during this work, and hands, fingers, etc., will be pinched and squeezed between the pressure pad and the pressure receiving surface.

In view of the above-mentioned points, the present invention provides a pressurizing device equipped with a safety device that prevents hands, fingers, etc. from being pinched and squeezed between the pressurizing pad and the pressurizing surface. It is intended to.

According to the present invention, the present invention has a base having a pressure receiving surface, which is provided movably in directions toward and away from the pressure receiving surface, and which cooperates with the pressure receiving surface to apply pressure to an object sandwiched therebetween. A drive connection that drives and connects a pressure plate member that applies pressure, a drive source device, an output member of the drive source device, and the pressure plate member such that they can be relatively displaced by a predetermined amount with respect to the moving direction of the pressure plate member. a mechanism, a first detection means for detecting that the pressure plate member approaches the pressure receiving surface by a predetermined amount, and a second detection means for detecting that the pressure plate member and the output member are displaced relative to each other. a detection means, and controls the operation of the drive source device, and the first detection means and the second detection means detect the pressure plate member and the pressure plate member before the pressure plate member approaches the pressure receiving surface by a predetermined amount. and a control device for interrupting the driving of the pressure plate member in the direction toward the pressure receiving surface when it is detected that the output member is relatively displaced with respect to the pressure receiving surface. It will be achieved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

1 to 5 are side views showing one embodiment of a press-type stencil printing device incorporating a pressure device according to the present invention in each operating state, and FIG. 6 shows the main parts thereof. FIG. In the figure,
Reference numeral 1 indicates a base, and this base 1 has a pressure receiving surface 2 on a part of its upper surface. A holder 3 for holding the printing paper placed on the pressure receiving surface 2 is attached to the base 1.

A bracket 4 is fixed on the base 1,
This bracket 4 supports a shaft 5. The shaft 5 rotatably supports one end of each of a pad assembly 6, a pad support lever 7, and a drive lever 8.

The pad assembly 6 has a push rod 11 that is movable while being guided by a guide sleeve 10 attached to the casing 9. The push rod 11 is made of an elastic material such as sponge at one end, that is, the lower end. The pad element 12 is supported by the pad element 12, and a roller 13 is rotatably supported at the other end, that is, the upper end. The push rod 11 is biased by a spring 14 in a direction in which the pad element 12 is moved away from the pressure receiving surface 2.

A limit switch 16 is attached to the pad element 12 via a fixture 15. As shown in FIGS. 1 to 4, this limit switch 16 closes the contact until the pad element 12 is pressed against the pressure receiving surface 2 with a predetermined pressure and is lowered by a predetermined amount with respect to the casing 9. The contact is configured to open when the pad element 12 is lowered by a predetermined amount or more relative to the casing 9.

The casing 9 is also provided with a paper holder 17 for holding the stencil paper.

The pad support lever 7 is attached to the arm 1 at its tip.
It holds one end of 8. The arm 18 has a rectangular opening 18' near its tip, and the roller 13 is movably engaged in this opening 18'.

The drive lever 8 has an engagement pin 19 on one side, which engages with a play in a hole 20 provided in the pad support lever 7.
Further, the drive lever 8 has a roller 21 pivotally supported at its tip, and this roller 21 faces the back surface of the pad support lever 6. As a result, the pad support lever 7 can be moved to a position where it is engaged with the engagement pin 19 at one end of the hole 20 as shown in FIGS. As shown, it is rotatable with respect to the drive lever 8 between a position where it abuts the roller 21 on its back surface. This rotation angle may be approximately 1° to 3°. That is, the drive lever 8 and the pad support lever 7 are connected to each other so that they can be relatively displaced by a predetermined amount in the rotational direction.

A micro switch (second detection means) 22 is attached to the pad support lever 7, and this micro switch 22 is activated by the weight of the pad assembly 6 as shown in FIGS. When the pad support lever 7 is located at a position where one end of the hole 20 abuts the engagement pin 19, the contact is closed, whereas one end of the hole 20 is engaged as shown in FIGS. When the pad support lever 7 is located at a position away from the dowel pin 19 and in contact with the roller 21 on the back side, the contact is opened.

A frame 23 is mounted on the base 1, and this frame 23 is equipped with an electric motor 2 that can rotate in forward and reverse directions.
It carries 4. One end of a crank arm 26 is fixed to an output shaft 25 of the electric motor 24. The crank arm 26 pivotally supports one end of a connecting rod 28 via a pin 27 at its tip. The connecting rod 28 is pivoted on the shaft of the roller 21 at its other end. Output shaft 25
When rotated in the normal direction, it rotates counterclockwise as seen in FIGS. 1 to 5, whereas when rotated in the reverse direction, it rotates clockwise as seen in the figures.

The output shaft 25 carries two cams 29,30. Two limit switches 32 and 33 are attached to the frame 23 by fixtures 31. Limit switches 32 and 33 are each cam 2
9 and 30, the opening and closing of the contacts are controlled. The limit switch (first detection means) 32 opens its contacts until the pad assembly 7 approaches the pressure receiving surface 2 by a predetermined amount or more, whereas the pad assembly 6 approaches the pressure receiving surface 2 by a predetermined amount or more. When this happens, the contacts close. Under normal operating conditions, the limit switch 32 closes its contacts before the contacts of the microswitch 22 open.
The limit switch 33 connects contacts a and b, as shown in FIG. 7, only when the pad assembly 6 is in the raised position as shown in FIG. 1, and otherwise connects contacts a and b. It is designed to connect with c.

FIG. 7 is a control circuit diagram of the electric motor 24 including the limit switch as described above. In Figure 7, 3
4 is a power source, 35 is a power switch, 36 is a fuse, 37 is an indicator lamp, 38 is an emergency stop switch, 39 is a relay switch, and 40 is a start switch. The relay switch 39 has two make contacts 41, 42 and one switching contact 43, and the switching contact 43 connects contacts d and e when the relay switch 39 is energized.
On the other hand, when the relay switch 39 is demagnetized, contacts d and f are connected. The electric motor 24 drives the output shaft 25 in normal rotation when the contacts d and e are connected, and drives the output shaft 25 in normal rotation when the contacts d and f are connected.
It is configured to drive in reverse.

The operation of the device of the present invention will be explained below with reference to each figure.

FIG. 1 shows the pad assembly 6 in the raised position, i.e., the starting position, and the paper holder 17 opened. Attachment of the stencil paper and setting of printing paper and masking sheets are performed in this state. In addition, in this state, the contacts of the switch in the control circuit of the electric motor 24 are opened and closed as shown in FIG.

After the stencil paper is attached to the pad assembly 6 by the paper holder 17 and the printing paper and masking sheet are set on the pressure receiving surface 2, the contacts of the power switch 35 are closed and the start switch 40 is turned off. When the contacts are closed, the power switch 35,
Emergency stop switch 38, limit switch 3
3. The relay switch 39 is energized via the start switch 40 and the micro switch 22, and is energized. When the relay switch 39 is energized, the make contacts 41 and 42 are closed, and contacts d and e of the switching contact 43 are connected.
As a result, the electric motor 24 drives the output shaft 25 in normal rotation. Thereafter, even if the start switch 40 is opened, the make contact 41 is closed, so that the relay switch 39 is maintained energized, and the output shaft 25 of the electric motor 24 continues to rotate in the normal direction.

As shown in FIG. 2, the forward rotation of the output shaft 25 causes the crank arm 26 to rotate counterclockwise in the figure, and in response, the drive lever 8 and pad support lever 7 are rotated around the shaft 5. Rotate counterclockwise as shown in the figure to lower the pad assembly 6. When the output shaft 25 rotates forward from its rotation start position, the contact a of the limit switch 33 is connected to the contact c instead of the contact b.

As the output shaft 25 rotates forward, the pad assembly 6 descends and approaches the pressure receiving surface 2. Particularly in this embodiment, when the pad assembly 6 is lowered to the extent that a hand or finger cannot be inserted between the pad assembly 6 and the pressure receiving surface 2, the pad assembly 6 is lowered as shown in FIG. When the pad assembly 6 moves one step before the solid body 6 substantially contacts the pressure receiving surface 2, the contact point of the limit switch 32 is closed. Then, the pad assembly 6 comes into contact with the pressure receiving surface 2, and the drive lever 8 continues to be rotated around the shaft 5 in the counterclockwise direction in the figure by the electric motor 24, so that the drive lever 8 is rotated. The roller 21 rotates relative to the support lever 7 until it comes into contact with the back surface of the pad support lever 7. As a result, the engagement pin 19 is separated from one end surface of the hole 20, and the contact point of the micro switch 22 is opened. However, at this time, since the contact point of the limit switch 32 is closed as described above, the electric motor 24 continues to be energized.
The output shaft 25 rotates normally. As a result, the drive lever 8
The rotational force passes through the roller 21 and is applied to the pad support lever 7.
, and the pad support lever 7, together with the drive lever 8, continues to rotate around the shaft 5 in the counterclockwise direction in the figure. As a result, the pad element 12 is pressed toward the pressure receiving surface 2. The support lever 7 continues to rotate, so that the push rod 11 is lowered relative to the casing 9, so that the pad element 12 is compressed. As shown in FIG. 4, when the amount of descent of the push rod 11 reaches a predetermined value, the limit switch 16 is opened to stop energizing the relay switch 39, and the relay switch 39 is demagnetized. Then, make contacts 41 and 42 open, and contact d of switching contact 43 is connected to contact f instead of contact e. As a result, the output shaft 25 of the electric motor 24 is reversed. By reversing the output shaft 25, the crank arm 26 rotates clockwise in the figure, and the drive arm 8, support lever 7, and pad assembly 6 are each rotated clockwise around the shaft 5 to assemble the pads. Raise solid 6. When the pad assembly 6 is raised to the starting position as shown in FIG.
is connected to contact b instead of contact c, power supply to the motor 24 is stopped, and the output shaft 25
The reverse rotation stops.

As shown in FIG. 5, while the pad assembly 6 is descending, it comes into contact with the hand or fingers.
When the descending movement is obstructed, the pad support lever 7 together with the pad assembly 6 moves against the drive lever 8.
Rotate until the back surface of this comes into contact with the roller 21. Then, the micro switch 22 is opened, and the relay switch 39 is deenergized and demagnetized. As a result, make contact 4
1 and 42 open, contact d of switching contact 43 is connected to contact f instead of contact e, and output shaft 25 of electric motor 24 is immediately reversed. As a result, the pad assembly 6 stops lowering at that position and rises toward the starting position as shown in FIG.

In this way, until the pad assembly 6 is one step short of substantially contacting the pressure receiving surface 2, that is, before the pad assembly 6 is lowered to the extent that a hand or finger cannot be inserted between the two, When force acts,
By interrupting the descent of the pad assembly 6 and returning it to the starting position, accidents such as hands or fingers being pinched between the pad assembly 6 and the pressure receiving surface 2 are prevented. be done.

Further, when the emergency stop switch 38 is pressed and its contacts are opened while the pad assembly 6 is being lowered, the relay switch 39 is de-energized, and the electric motor 24 is de-energized. The rotation of the output shaft 25 stops. After that, when the contacts of the emergency stop switch 38 are closed,
At this time, contacts a and c of the limit switch 33
is connected, and the contact d of the switching contact 43 is connected to the contact f, so that the output shaft 25 of the motor 24 rotates in the reverse direction, and the pad assembly 6 returns to the starting position. Furthermore, even if the contacts of the power switch 35 are opened while the pad assembly 6 is descending, or if the power supply is stopped due to a power outage, etc., the relay switch 39 is demagnetized and the emergency stop switch 3 is activated.
8 is operated, upon restart, the output shaft 25 of the electric motor 24 is reversed, and the pad assembly 6 returns to the starting position. This means that the output shaft 2
5 rotates in the normal direction and enters the printing state, if the printing paper is misaligned while it is stopped, it may cause printing errors, so when re-energizing, please return the pad assembly 6 to the starting position and start the printing process again. This is for the purpose of

In the above, the present invention has been described in detail with reference to specific embodiments, but it will be appreciated by those skilled in the art that the present invention is not limited to this and that various embodiments are possible within the scope of the present invention. It should be obvious.

[Brief explanation of the drawing]

1 to 5 are side views showing one embodiment of a press-type stencil printing device incorporating a pressure device according to the present invention in each operating state, and FIG. 6 shows the main parts thereof. The plan view and FIG. 7 are electrical circuit diagrams. 1...Base, 2...Pressure receiving surface, 3...Holder,
4... Bracket, 5... Shaft, 6... Pad assembly, 7... Pad support lever, 8... Drive lever, 9... Casing, 10... Guide sleeve, 11... Push rod, 12... Pad Element, 13...Roller, 14...Spring, 15...Mounting tool, 16...Limit switch, 17...Base paper holder, 18...Arm, 19...Engagement pin, 2
0... Hole, 21... Roller, 22... Micro switch, 23... Frame, 24... Electric motor, 2
5...Output shaft, 26...Crank arm, 27...
...pin, 28...connecting rod, 29,
30...Cam, 31...Mounting tool, 32, 33...
Limit switch, 34...Power supply, 35...Power switch, 36...Fuse, 37...Indication lamp, 38...Emergency stop switch, 39...Relay switch, 40...Start switch, 41, 42...
...Make contact, 43...Switching contact.

Claims (1)

[Scope of utility model registration request] a base having a pressure receiving surface; a pressure plate member that is movable in directions toward and away from the pressure receiving surface and cooperates with the pressure receiving surface to pressurize an object sandwiched therebetween; and a drive source. a drive coupling mechanism that drives and connects the output member of the drive source device and the pressure plate member such that they can be displaced relative to each other by a predetermined amount with respect to the movement direction of the pressure plate member; a first detection means for detecting that the pressure receiving surface has approached a predetermined amount; a second detection means for detecting that the pressure plate member and the output member are displaced relative to each other; and operation of the drive source device. The first detection means and the second detection means detect that the pressure plate member and the output member are displaced relative to each other before the pressure plate member approaches the pressure receiving surface by a predetermined amount. and a control device that interrupts driving of the pressure plate member in a direction toward the pressure receiving surface when the pressure plate member is detected.