JP4364366B2 - Locking mechanism of cylinder unit in stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a locking mechanism for locking a cylinder unit to a printing position of a frame in a stencil printing machine for printing on paper using stencil paper.
[0002]
[Prior art]
In general, in a stencil printing machine, a cylinder is rotatably supported by a frame, and a stencil sheet having holes of a predetermined printing pattern is wound around the outer periphery of the cylinder. Then, while the cylinder is rotated, the paper is fed to the outer periphery of the cylinder, and ink is supplied from the inside of the cylinder through the holes of the stencil sheet so that a predetermined printing pattern is printed on the paper. It has become.
[0003]
In the stencil printing machine having such a configuration, since the ink adheres to the cylinder itself and the inside thereof during printing, the cylinder unit including the cylinder is attached to the frame for periodic maintenance, cleaning, etc. And is configured to be detachable through a guide mechanism. A lock mechanism is interposed between the cylinder unit and the frame. When the cylinder unit is moved from the inspection position where the cylinder unit is pulled out from the frame to the printing position, the cylinder unit is locked to the printing position by the lock mechanism. It has become.
[0004]
Conventionally, the lock mechanism is configured as follows. When the cylinder unit is pushed from the inspection position to the printing position, the pair of lock pins provided on the left and right side edges of the cylinder unit opening on the left and right sides of the cylinder unit are formed on the support frame side of the cylinder unit. A pair of automatic locking mechanisms can be switched to the locked state. Further, when releasing this locked state, the locked state of both automatic lock mechanisms is released in synchronization by operating a release operation bar that is constructed and connected to a pair of left and right automatic lock mechanisms. Yes.
[0005]
[Problems to be solved by the invention]
Since the conventional cylinder unit locking mechanism includes a pair of left and right automatic locking mechanisms, the cylinder unit can be stably locked to the frame. However, since both the left and right lock mechanisms are automatically locked, there is a problem that it is difficult to confirm whether or not the pair of lock levers has been securely rotated to the lock position with respect to the pair of left and right lock pins. It was. Further, regarding the operation of releasing the locked state, it is not always easy to confirm whether or not the pair of lock levers has actually been moved from the lock position to the unlock position.
[0006]
An object of the present invention is to solve the above-described problems in the prior art, so that an operator can easily confirm that the lock mechanism has been switched to the locked state, and can be easily switched to the unlocked state. It is an object of the present invention to provide a cylinder unit locking mechanism in a stencil printing machine.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention described in claim 1 is characterized in that a cylinder unit is configured by rotatably mounting a cylinder around which a stencil sheet is wound on a support frame, and the frame (23, 24) The cylinder unit is mounted so as to be able to reciprocate between a printing position and an inspection position via a guide mechanism, and ink is supplied to the paper fed to the outer periphery of the cylinder via the stencil sheet for printing. In the stencil printing machine, the locking mechanism for locking the cylinder unit in the printing position includes an automatic locking mechanism that is automatically locked when the cylinder unit is moved to the printing position, and the automatic locking mechanism. In the locked state, a manual lock mechanism for manually locking the support frame with respect to the frame, and provided between the automatic lock mechanism and the manual lock mechanism, In the locked state of the click mechanism, when the locked state of 該手 dynamic locking mechanism is released manually, and summarized in that those comprising a lock release mechanism for releasing the locked state of the automatic locking mechanism.
[0008]
According to a second aspect of the present invention, in the first aspect, the automatic lock mechanism is provided on one of a pair of left and right protective plates of a support member constituting a support frame of the cylinder unit, and the manual lock mechanism is provided on the protective plate. The gist is that a pair of left and right locking pins provided on the other side and attached to the frame are locked.
[0009]
According to a third aspect of the present invention, in the second aspect, the automatic lock mechanism includes an automatic lock lever attached to the one protection plate so as to be capable of reciprocating rotation, and the automatic lock lever is always unlocked. When the automatic lock lever is rotated from the unlock position to the lock position where one lock pin is engaged with the lock recess formed at the tip of the automatic lock lever, the automatic lock lever is An automatic lock / release lever is provided between the protective plate and the automatic lock / release lever for holding the lock position and releasing the locked state, and the automatic lock / release lever is always in the lock position. The manual lock mechanism is configured to be reciprocally rotatable with respect to the other protective plate and to lock the other lock pin. The lock release mechanism includes a lock release lever supported on the other protective plate so as to be capable of reciprocating rotation within a predetermined angle range, and a direction in which the lock release lever is always kept in a locked state. Urging means for urging the lock, a connecting bar for connecting the automatic lock / release lever and the lock release lever, and the manual lock lever, and rotating the lock release lever from the lock position to the unlock position. The gist of the present invention is that it is constituted by an operating projection to be obtained.
[0010]
According to a fourth aspect of the present invention, in the third aspect, between the support member and the manual lock lever, an erroneous operation prevention that holds the lock position while the manual lock lever is held at the lock position. The gist is that a mechanism is provided.
[0011]
According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the malfunction preventing mechanism includes an electromagnetic solenoid mounted on the other protection plate, and the solenoid moves into a rotation locus of the manual lock lever by the solenoid. The gist of the present invention is that it is constituted by a lock member held on the surface.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 8 shows a schematic configuration of the stencil printing machine. The cylinder 11 is provided so as to rotate in the clockwise direction about the rotation shaft 11a at the center in the main body 10 of the stencil printing machine, and a stencil sheet 12 is wound around the outer periphery thereof. The stencil sheet 12 is a heat-sensitive one in which Japanese paper and a resin film are overlapped. A predetermined printing pattern is baked on the stencil sheet 12, the resin film is melted, and only the Japanese paper remains. Print pattern holes are formed.
[0013]
The ink tank 13 disposed at a position below the rotary shaft 11a contains ink therein and is connected to a supply pump (not shown) to supply ink into the cylinder 11. The press roller 14 disposed at the lower position of the cylinder 11 is supported so as to rotate around the support shaft 14a while its peripheral surface is in contact with the outer periphery of the cylinder 11. A pressing roller 15 disposed in the cylinder 11 so as to face the pressing roller 14 presses the stencil sheet 12 against the surface of the pressing roller 14 while rotating clockwise.
[0014]
A plurality of sheets 17 are accommodated in a stacked state inside a sheet feeding cassette 16 mounted on the rear side (right side in FIG. 8) of the main body 10. These sheets 17 are sent one by one to the back of the main body 10 by the rotation of a sheet feeding roller 18 arranged to press and feed the sheet 17 at the lower part of the sheet feeding cassette 16. A pair of upper and lower feed rollers 19 and a guide plate 20 a provided between the paper feed cassette 16 and the cylinder 11 guide the paper 17 delivered from the inside of the paper feed cassette 16 and between the cylinder 11 and the press roller 14. To feed. Then, the cylinder 11 and the press roller 14 are rotated, and ink is supplied from the cylinder 11 through the hole of the stencil sheet 12 to the paper 17, and a predetermined printing pattern is printed on the paper 17. The printed sheet 17 is guided by a guide plate 20b disposed on the side of the press roller 14 and discharged to a sheet discharge tray 21 disposed in front of the main body 10 (on the left side in FIG. 8). And held in a stacked state.
[0015]
The cylinder 11 is rotatably mounted in a cylinder unit 30 that can be inserted and removed from the side of the main body 10. As shown in FIG. 2, the cylinder unit 30 is mounted so as to be capable of reciprocating in the front-rear direction by a pair of left and right guide rails 22 installed between a pair of frames 23 and 24 constituting a pair of side walls of the main body 10. Yes. In FIG. 1, front and rear and left and right are indicated by arrows with respect to the cylinder unit 30. An opening 24 a for taking in and out the cylinder unit 30 is formed in the frame 24. Therefore, the configuration of the cylinder unit 30 will be described below with reference to FIGS.
[0016]
As shown in FIGS. 1 and 2, the support frame 31 constituting the cylinder unit 30 includes a support plate 32 disposed on one end side (front side in FIGS. 1 and 2), a support member 33 disposed on the rear side, It comprises a pair of left and right support rails 34 having an L-shaped cross section that is installed between both sides of the support plate 32 and the support member 33. The rotary shaft 11a is rotatably supported between the center portions of the support plate 32 and the support member 33 via a bearing 35, and the cylinder 11 is attached to the rotary shaft 11a.
[0017]
As shown in FIGS. 1 and 3, a pair of left and right protection plates 33 a and 33 b are formed at both side edges of the support member 33, and an ink holder that accommodates the ink tank 13 in the center between the protection plates 33 a and 33 b. (Not shown) is provided. A support rod 37 having a round bar shape is installed between the support plate 32 and the support member 33 at a position above the cylinder 11 so that the cylinder unit 30 is manually switched between a printing position and an inspection position. Although not shown, a mechanism for stopping the cylinder unit 30 at the inspection position shown in FIG. 1 is mounted between the support rod 37 and the frame 24.
[0018]
The cylinder unit 30 includes the support frame 31, the cylinder 11, the rotating shaft 11a, the ink holder (not shown), the ink tank 13, the support rod 37, and the like. A pair of guide rails 22, 22 installed on the frames 23, 24 so as to sandwich the cylinder unit 30 from the left and right forms a concave shape opened to the side, and both support rails 34 are accommodated inside thereof. The cylinder unit 30 is supported in the main body 10. Guide rollers 34a and 22a are respectively provided at one end of each support rail 34 and the end of each guide rail 22, and the support rail 34 is reciprocated on the guide rail 22 by both guide rollers 34a and 22a. ing. That is, the cylinder unit 30 is configured to be able to move from the printing position in the main body 10 to the inspection position pulled out sideways while being guided in the pulling direction by the guide rail 22 and the support rail 34.
[0019]
In this embodiment, the guide mechanism 36 of the cylinder unit 30 is configured by the above-described guide rail 22, guide roller 22a, support rail 34, guide roller 34a, and the like.
[0020]
Lock pins 42a and 42b are attached to the left and right side edges of the opening 24a of the frame 24 via a pair of left and right brackets 41 so as to face each other.
[0021]
On the other hand, the support member 33 of the cylinder unit 30 is provided with a lock mechanism 43 for locking the cylinder unit 30 in the printing position with respect to the lock pins 42a and 42b. The lock mechanism 43 is connected to the automatic lock mechanism 44 attached to the left protection plate 33a of the support member 33, the manual lock mechanism 45 attached to the right protection plate 33b, and the automatic lock mechanism 44 and the manual lock mechanism 45. It is comprised by the lock release mechanism 46 with which it mounted | wore.
[0022]
Therefore, the configuration of the automatic lock mechanism 44 will be described below.
As shown in FIG. 4, an automatic lock lever 51 is supported on the protective plate 33a by a support pin 52 so as to be reciprocally rotatable. A lock recess is formed at one end of the automatic lock lever 51 so as to correspond to the lock pin 42a. 51a is formed. A spring accommodating portion 53 is integrally formed at the central portion of the automatic lock lever 51, and one end of a coil spring 54 as an urging means wound around the support pin 52 is engaged with an edge of the spring accommodating portion 53. The other end of the coil spring 54 is locked to a locking pin 55 penetrating and supported by the protective plate 33a. Then, the automatic lock lever 51 is urged and held by the coil spring 54 at the unlock position separated from the lock pin 42a.
[0023]
A guide groove 33c into which the lock pin 42a can enter is formed in the protection plate 33a. An automatic lock / release lever 56 is supported on the protective plate 33a by a support pin 57 so as to be reciprocally rotatable. The other end of the automatic lock lever 51 is formed by a locking projection 56a formed on the automatic lock / release lever 56. The automatic lock lever 51 can be held in the locked position by locking the locking recess 51b formed in the above.
[0024]
The automatic lock / release lever 56 is formed with a rotation range restricting hole 56b. By inserting a rotation range restricting pin 58 penetrating and fixed to the protective plate 33a into the rotation range restricting hole 56b, the automatic lock / release lever 56 The tilt range of 56 is restricted. A coil spring 59 as an urging means is wound around the outer periphery of the support pin 57, one end of which is locked by a locking pin 60 penetrating and fixed to the protection plate 33 a, and the other end of the support pin 57 by an automatic lock / release lever 56. It is locked to a spring receiver 56c formed by cutting and raising. The automatic lock / release lever 56 is always urged by the coil spring 59 in a direction to hold the lock position of the automatic lock lever 51.
[0025]
Next, the manual lock mechanism 45 will be described with reference to FIGS.
As shown in FIG. 6, a manual lock lever 61 is supported on the protection plate 33 b by a support pin 62 so as to be reciprocally rotatable. A lock recess 61 a is formed at the tip of the manual lock lever 61. Then, as shown in FIG. 7, the lock pin 42b provided on the frame 24 side is inserted into the guide groove 33d formed in the protective plate 33b so that the lock pin 42b can be engaged and disengaged.
[0026]
Next, the lock release mechanism 46 will be described.
A lock release lever 63 is attached to the protection plate 33b by a support pin 64 so as to be reciprocally rotatable. A rotation range restriction pin 58a is penetrated and fixed to the protection plate 33b, and the rotation range restriction pin 58a is inserted into a rotation range restriction hole 63b formed in the lock release lever 63 so that the tilt angle of the lock release lever 63 is increased. It is regulated within a predetermined angle range. A coil spring 65 is wound around the support pin 64, one end of which is locked by a lock pin 66 penetrating and fixed to the protection plate 33b, and the other end is engaged by a spring receiver 63c formed by cutting and raising the lock release lever 63. It has been stopped.
[0027]
A bracket 63d is formed at the upper end of the lock release lever 63, and a connecting bar 67 is provided between the bracket 56d formed at the upper end of the automatic lock / release lever 56 and the bracket 63d as shown in FIGS. They are erected and connected by screws 68. The coil spring 65 urges the lock release lever 63 counterclockwise around the support pin 64, that is, the automatic lock / release lever 56 in the lock direction via the connecting bar 67.
[0028]
The manual lock lever 61 is formed with an operating projection 61b for pushing the lock release lever 63 to switch the lock release lever 63 from the locked position to the unlocked position.
[0029]
Between the upper ends of the protective plates 33a and 33b, a connecting rod 69 having a handle function for an operator to grip and take in and out the cylinder unit 30 is installed and connected.
[0030]
As shown in FIG. 6, the protection plate 33b is provided with a malfunction prevention mechanism 70 for holding the lock position of the manual lock lever 61. The malfunction prevention mechanism 70 includes an electromagnetic solenoid 71 and a lock lever 73 that tilts around a connecting pin 74 by a plunger 72 thereof. Then, as shown in FIG. 7, when the tip of the lock lever 73 tilts and enters the movement locus of the protrusion 61c formed on the manual lock lever 61, the manual lock lever 61 is erroneously changed from the locked position to the unlocked position. It is not rotated.
[0031]
Next, the operation of the stencil printing machine configured as described above will be described.
When printing is performed by the stencil printing machine shown in FIG. 8, first, the paper 17 is fed from the paper cassette 16 to the pair of feed rollers 19 by the paper feed roller 18 inside the main body 10 and guided to the guide plate 20a. In the meantime, it is supplied between the rotating cylinder 11 and the press roller 14. On the other hand, in the cylinder 11, ink is supplied from the ink tank 13 to the surface of the pressing roller 15 via a supply pump. The ink on the surface of the pressing roller 15 is squeezed onto the sheet 17 through the holes of the stencil sheet 12 wound around the outer periphery of the cylinder 11 by being pressed by the pressing roller 14, and is printed with a predetermined printing pattern. The The printed paper 17 is sent to the guide plate 20b by the rotation of the cylinder 11 and the press roller 14, and is discharged and held on the paper discharge tray 21 while being guided by the guide plate 20b.
[0032]
After printing is performed in this manner, when exchanging the stencil sheet 12 on the outer periphery of the cylinder 11 or cleaning the ink adhering to the periphery of the cylinder 11, the cylinder unit 30 including the cylinder 11 is inserted from the inside of the main body 10. It is necessary to take it out.
[0033]
FIG. 1 shows a state in which the cylinder unit 30 is pulled out from the printing position and is held at the inspection position where maintenance inspection and the like are performed. In this state, both the automatic lock mechanism 44 and the manual lock mechanism 45 are unlocked. When the cylinder unit 30 that has undergone maintenance inspection in this state is pushed along the guide rail 22 to the printing position, the cylinder unit 30 moves toward the printing position while the support rail 34 is guided by the guide rail 22.
[0034]
When the movement of the cylinder unit 30 approaches the final stroke, the automatic lock lever 51 of the automatic lock mechanism 44 corresponds to the lock pin 42a as shown in FIG. 4, and the automatic lock lever 51 is centered on the support pin 52 by the lock pin 42a. 4 is rotated counterclockwise in FIG. 4 against the urging force of the coil spring 54. In this process, the lock pin 42a is guided and moved to the lock recess 51a by the guide protrusion 51c provided at the tip of the automatic lock lever 51. As a result, as shown in FIG. 5, the lock pin 42a is engaged in the lock recess 51a of the automatic lock lever 51, and the lock pin 42a is in contact with the inner top portion of the guide groove 33c. Is almost vertical. For this reason, the locking projection 56a of the automatic lock / release lever 56 is locked to the locking recess 51b of the automatic lock lever 51 by the biasing force of the coil spring 59, and the automatic lock lever 51 is in a locked state in which the lock pin 42a is held. Retained. In this manner, the automatic lock mechanism 44 is automatically switched to the lock position by the final stroke of the pushing operation of the cylinder unit 30 to the printing position.
[0035]
Next, the operation of the manual lock mechanism 45 will be described with reference to FIGS.
FIG. 6 shows an unlocked state of the manual lock mechanism 45 corresponding to the unlock position of the automatic lock mechanism 44 shown in FIG. When the cylinder unit 30 is further pushed forward in this state, the inner top portion of the guide groove 33d comes into contact with and is locked to the lock pin 42b. When the manual lock lever 61 is rotated clockwise about the support pin 62 in this state, the lock recess 61a of the manual lock lever 61 is engaged with the lock pin 42b as shown in FIG. 7, and the manual lock lever 61 is locked. Kept in a state. The lock release lever 63 is pivotally held at the lock position shown in FIG. 7 via the connecting bar 67 by the tilting of the automatic lock / release lever 56 shown in FIG. 5 to the lock position.
[0036]
In the locked state of the manual lock lever 61 shown in FIG. 7, since the lock lever 73 is rotated and locked by the electromagnetic solenoid 71 with respect to the protrusion 61c, the locked state of the manual lock lever 61 is not released by mistake. Absent.
[0037]
To release the lock state of the lock mechanism 43 in order to move the cylinder unit 30 from the printing position to the inspection position in the locked state of the automatic lock lever 51 and the manual lock lever 61 shown in FIGS. The electromagnetic solenoid 71 switches the lock lever 73 to the unlock position.
[0038]
Next, the manual lock lever 61 is rotated counterclockwise about the support pin 62. Then, the lock recess 61a is removed from the lock pin 42b to be switched to the unlock position, and the lock release lever 63 is pushed by the operation protrusion 61b formed on the manual lock lever 61. Therefore, the lock release lever 63 is a coil spring. The automatic lock / release lever 56 shown in FIG. 5 is counteracted against the urging force of the coil spring 59 via the connecting bar 67 by rotating clockwise around the support pin 64 against the urging force of 65. And rotated in the same direction. Therefore, the locking projection 56a of the automatic lock / release lever 56 is released from the locking recess 51b of the automatic lock lever 51, and the automatic lock lever 51 is rotated clockwise around the support pin 52 by the biasing force of the coil spring 54. It is rotated. Therefore, the lock recess 51a and the guide projection 51c are rotated so as to push the lock pin 42a forward, and the lock state of the automatic lock lever 51 is released.
[0039]
Next, the effects of the lock mechanism 43 of the cylinder unit 30 configured as described above will be listed together with the configuration.
(1) In the above-described embodiment, the lock mechanism 43 is configured by the automatic lock mechanism 44, the manual lock mechanism 45, and the lock release mechanism 46 that couples both mechanisms. For this reason, the lock operation can be performed so that the operator can directly confirm that the cylinder unit 30 is locked at the printing position by the manual lock mechanism 45, and the lock state can be easily confirmed.
[0040]
Further, since the operator also performs the operation of moving the manual lock mechanism 45 from the lock position to the unlock position, the unlock position can be confirmed. For this reason, the locked position or unlocked position of the cylinder unit 30 can be easily confirmed.
[0041]
(2) In the above embodiment, the operation protrusion 61b is formed integrally with the manual lock lever 61 of the manual lock mechanism 45 to push the lock release lever 63, thereby switching from the lock position to the unlock position. I made it. For this reason, the mechanism of the lock release mechanism 46 can be simplified and can be manufactured and assembled easily.
[0042]
(3) In the above-described embodiment, the connecting rod 69 is installed between the protective plate 33a and the protective plate 33b, and the lock state of the automatic lock mechanism 44 is released by gripping the connecting bar 67 and the connecting rod 69. I did it. For this reason, the lock state of the automatic lock mechanism 44 can be released without using the manual lock lever 61.
[0043]
(4) In the above-described embodiment, the operation protrusion 61 b of the manual lock lever 61 is configured to be separable from the lock release lever 63. For this reason, when the automatic locking mechanism 44 performs the automatic locking operation, the unlocking lever 63 of the unlocking mechanism 46 is interlocked, but this interlocking motion does not interfere with the manual locking lever 61.
[0044]
In addition, this embodiment can also be changed and embodied as follows.
-You may comprise a rotation biasing means with a leaf | plate spring, sponge, rubber | gum etc., for example.
-Either one of the coil spring 59 or the coil spring 65 may be omitted.
[0045]
【The invention's effect】
As described above in detail, according to the first to fifth aspects of the invention, the operator can easily confirm that the lock mechanism has been switched to the locked state, and can easily confirm the switch to the unlocked state. can do.
[0046]
According to the second aspect of the present invention, the automatic lock mechanism and the manual lock mechanism can be mounted using the pair of left and right protective plates of the support member constituting the support frame, and the locked state can be stably maintained.
[0047]
The invention according to claim 3 can simplify the lock mechanism.
The invention according to claim 4 can reliably hold the lock state of the manual lock lever.
[0048]
According to the fifth aspect of the present invention, the manual lock lever can be held at the lock position by the electromagnetic solenoid.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a lock mechanism of a cylinder unit embodying the present invention.
FIG. 2 is a left side view showing a state where a cylinder unit is moved to a printing position.
FIG. 3 is a front view showing a lock mechanism.
FIG. 4 is a side view showing an unlocked state of the automatic locking mechanism.
FIG. 5 is a side view showing a locked state of the automatic locking mechanism.
FIG. 6 is a side view showing an unlocked state of the manual lock mechanism.
FIG. 7 is a side view showing a locked state of the manual lock mechanism.
FIG. 8 is a schematic side view of a stencil printing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Cylinder, 12 ... Stencil paper, 24 ... Frame, 30 ... Cylinder unit, 31 ... Support frame, 33 ... Support member, 33a, 33b ... Protection plate, 36 ... Guide mechanism, 42a, 42b ... Lock pin, 43 ... Lock Mechanism: 44 ... Automatic lock mechanism, 45 ... Manual lock mechanism, 46 ... Unlock mechanism, 51 ... Automatic lock lever, 51a, 61a ... Lock recess, 54, 59, 65 ... Coil spring as biasing means, 56 ... Automatic Lock / release lever, 61 ... Manual lock lever, 61b ... Operating protrusion, 63 ... Lock release lever, 67 ... Connection bar, 70 ... Malfunction prevention mechanism, 71 ... Electromagnetic solenoid, 73 ... Lock lever as a lock member.

Claims (5)

A cylinder (11) for winding the stencil sheet (12) is rotatably mounted on the support frame (31) to constitute a cylinder unit (30), and a guide mechanism (36) is mounted on the frames (23, 24). The cylinder unit (30) is mounted so as to be able to reciprocate between a printing position and an inspection position, and ink is supplied to the sheet fed to the outer periphery of the cylinder (11) via the stencil sheet. In a stencil printing machine that is designed to perform printing,
The lock mechanism (43) for locking the cylinder unit (30) in the printing position is:
An automatic locking mechanism (44) that is automatically locked when the cylinder unit (30) is moved to the printing position;
A manual lock mechanism (45) for manually locking the support frame (31) with respect to the frame (24) in a locked state of the automatic lock mechanism (44);
Provided between the automatic lock mechanism (44) and the manual lock mechanism (45), and when the manual lock mechanism (45) is unlocked manually in the locked state of the manual lock mechanism (45). A locking mechanism for a cylinder unit in a stencil printing machine, comprising an unlocking mechanism (46) for releasing the locked state of the automatic locking mechanism (44). In Claim 1, the automatic locking mechanism (44) is provided on one of a pair of left and right protection plates (33a, 33b) of a support member (33) constituting a support frame (31) of the cylinder unit (30), A manual lock mechanism (45) is provided on the other side of the protective plate (33a, 33b), and is a cylinder in a stencil printing machine that locks a pair of left and right lock pins (42a, 42b) attached to the frame (24). Unit locking mechanism. In claim 2, the automatic locking mechanism (44) comprises:
An automatic lock lever (51) attached to the one protective plate (33a) so as to be reciprocally rotatable;
A biasing means (54) for constantly biasing the automatic lock lever (51) to the unlock position;
When the automatic lock lever (51) is rotated from the unlock position to the lock position where one lock pin (42a) is engaged with the lock recess (51a) formed at the tip thereof, the automatic lock lever ( 51) is held in the locked position, and an automatic lock / release lever (56) for releasing the locked state;
The urging means (59) is provided between the protective plate (33a) and the automatic lock / release lever (56) and always urges the automatic lock / release lever (56) to the locked position. And
The manual lock mechanism (45) is a manual lock lever (61) having a lock recess (61a) for reciprocating rotation with respect to the other protective plate (33b) and for locking the other lock pin (42b). Composed of
The lock release mechanism (46) includes a lock release lever (63) supported by the other protective plate (33b) so as to be capable of reciprocating rotation within a predetermined angular range.
An urging means (65) for urging the unlocking lever (63) in a direction to always maintain the locked state;
A connection bar (67) for connecting the automatic lock / release lever (56) and the lock release lever (63);
Locking of a cylinder unit in a stencil printing press comprising an operating projection (61b) provided on the manual lock lever (61) and capable of rotating the lock release lever (63) from a locked position to an unlocked position mechanism. 4. The malfunction prevention according to claim 3, wherein the manual lock lever (61) is held between the support member (33) and the manual lock lever (61) while the manual lock lever (61) is held at the lock position. A cylinder unit locking mechanism in a stencil printing machine provided with a mechanism (70). 5. The malfunction prevention mechanism (70) according to claim 4, wherein the malfunction prevention mechanism (70) includes an electromagnetic solenoid (71) mounted on the other protective plate (33b), and a turning locus of the manual lock lever (61) by the solenoid (71). A locking mechanism for a cylinder unit in a stencil printing press comprising a lock member (73) that enters into and is held at a lock position.

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