GB2215664A - Printing press having a printing roller which always rotates in a unitary direction - Google Patents
Printing press having a printing roller which always rotates in a unitary direction Download PDFInfo
- Publication number
- GB2215664A GB2215664A GB8807019A GB8807019A GB2215664A GB 2215664 A GB2215664 A GB 2215664A GB 8807019 A GB8807019 A GB 8807019A GB 8807019 A GB8807019 A GB 8807019A GB 2215664 A GB2215664 A GB 2215664A
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- GB
- United Kingdom
- Prior art keywords
- pinion
- printing roller
- shaft
- keyway
- key
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000003086 colorant Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F3/00—Cylinder presses, i.e. presses essentially comprising at least one cylinder co-operating with at least one flat type-bed
- B41F3/46—Details
- B41F3/58—Driving, synchronising, or control gear
- B41F3/80—Driving, synchronising, or control gear for impression cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
In a printing press wherein the printing roller 21 effects a horizontally straight reciproating motion and means is provided for rotating the printing roller in a unitary direction whenever the roller is moved horizontally in any direction, two pinions 32A and 32B sleeved rotatably on the shaft 22 of the printing roller 21 rotate in opposite directions, each alternately clockwise and counterclockwise. When the printing roller 21 effects a horizontally straight reciporcating motion, and when either of the pinions 32A and 32B rotates in a predetermined direction, a locking member 35, 36 locks it on the shaft 22 by the engagement of a key 353, 363 and a keyway 313, 314 so that the printing roller 21 also rotates in the predeterminded direction. When one of the pinions 32A and 32B is locked on the shaft 22, the other of the pinions 32A and 32B is released from the shaft 22 by a release member 37, 38. <IMAGE>
Description
A PRINTING PRESS HAVING A PRINTING ROLLER WHICH
ALWA'ZS ROTATES IN A UNIFORM DIRECTION
This invention relates to a printing press, and more particularly to a highly efficient printing press.
A printing press is used for the production of printed impression on paper and other material. In a printing process, a printing roller effects a horizontally straight reciprocating motion. In a conventional printing press, as disclosed in British Patent No.
1 477 984, the printing roller rotates in one direction during its forward movement and in the opposite direction during its return movement
Additionally, an ink feeding means is disposed above the printing roller for transferring the printing ink from an ink reservoir onto the printing block of the printing roller.
It is understood that this two-direction rotation of the printing roller often results in significant difference between the printed colours of two consecutively printed papers due to the following reasons: 1. The printing roller effects the horizontallY straight reciprocating motion in a direction perpendicular to the direction from which the papers to be printed are fed. If the carrier means for carrying the printing roller is positioned inaccurately, a significant difference between the printed colours of two consecutively printed papers will occur.
2. The printing roller receives the printing ink from a set of ink transfer rollers during its forward movement and from another set of ink transfer rollers during its return movement. The printing ink supplied from two sets of ink transfer rollers onto the printing roller may result in a difference between the printed colours of two consecutively printed papers.
3. Two consecutively printed papers are printed from the opposite ends thereof so that a significant difference between the printed colours of the two papers results.
Furthermore, prior to printing, the carrier means must be adjusted and tested again and again until it is positioned accurately. This adjustment and testing process is time-consuming.
To solve these problems, I disclosed in U.K. Patent
Application No. 8712402 a printing press with a printing roller which always rotates in a uniform direction. This printing press has two pinions rotatable in opposite directions, each of the pinions being rotated in alternating clockwise and counterclockwise directions, and two locking means each used for automatically interlocking one of the pinions and the shaft of the printing roller when the pinion rotates in a predetermined direction. Each of the locking means, as shown in Fig. 1, includes an engaging member C and an annular member D. When the end C1 of the engaging member C engages with the notch D1 of the annular member D, the locking means is in a locked position.And, when the end C1 of the engaging member
C disengages from the notch D1 of the annular member Df the locking means is in an unlocked position
Recently, I tried another approach to the locking means.
It is therefore an object of this invention to provide a printing press with two locking means, each of which can be pushed by a release member to release the shaft of a printing roller from a pinion.
According to this invention, a printing press includes:
(1) a sliding-block linkage including a sliding block means and a toggle mechanism for driving the sliding block means to effect a horizontally straight reciprocating motion;
(2) a press base;
(3) a printing roller disposed above the press base and having a shaft connected to the sliding block means for synchronous horizontally straight reciprocating motion therewith;
(4) a first pinion and rack means including a first pinion mounted rotatably on the sliding block means, and a first rack fixed horizontally on the press base for meshing with the first pinion when the sliding block means is moved horizontally; and (5) means for stably rotating the printing roller in a uniform direction whenever the printing roller is moved horizontally in any direction, the rotating means including:
(a) a second pinion and rack means including a second pinion mounted rotatably on the shaft of the printing roller, and a second rack fixed horizontally on the press base below the second pinion for meshing with the second pinion when the shaft is moved horizontally; (b) a third pinion and rack means including a third pinion mounted rotatably on the shaft of the printing roller, and a third rack fixed horizontally on the press base above the third pinion for meshing with the third pinion when the shaft is moved horizontally; (c) a first locking means for automatically interlocking the second pinion and the shaft of the printing roller when the second pinion rotates in a predetermined direction; and (d) a second locking means for automatically interlocking the third pinion and the shaft of the printing roller when the third pinion rotates in the predetermined direction.
The first locking means includes: (a) a first ring sleeved rigidly on the shaft of the printing roller and having a first keyway formed in its peripheral surface; (b) a first sleeve mounted rotatably on the shaft of the printing roller near the first ring, the second pinion being connected securely to the first sleeve; (c) a first locking member mounted pivotally on the first sleeve and including a first key projecting radially inward therefrom, and a first spring biasing the first key to engage with the first keyway for interlocking the second pinion and the shaft of the printing roller; and (d) a first release member fixed on the first sleeve and extending toward the second locking means for releasing the third pinion from the shaft of the printing roller when the first key engages with the first keyway.
The second locking means includes: (a) a second ring sleeved rigidly on the shaft of the printing roller near the first ring and having a second keyway formed in its peripheral surface; (b) a second sleeve mounted rotatably on the shaft of the printing roller near the second ring, the third pinion being connected securely to the second sleeve; (c) a second locking member mounted pivotally on the second sleeve and including a second key projecting radially inward therefrom, and a second spring biasing the second key to engage with the second keyway for interlocking the third pinion and the shaft of the printing roller, the second locking member being pushed by the first release member to disengage the second key from the second keyway when the first key engages with the first keyway; and (d) a second release member fixed on the second sleeve and extending toward the first locking member, the second release member pushing the first locking member to disengage the second key from the second keyway when the second key engages with the second keyway.
Thereby, the second and third pinions are locked alternately on the shaft of the printing roller for driving the printing roller to always rotate in a uniform direction.
Other features and advantages of this invention will become apparent in the following detailed description of a preferred embodiment of this invention with reference to the accompanying drawings in which:
Fig. 1 is a schematic view illustrating the operation of a locking means used with a conventional printing press;
Fig. 2 is a schematic side view showing a part of a printing press according to this invention;
Fig. 3 is an exploded view showing a control means of the printing press according to this invention;
Fig. 4 is a schematic sectional view showing the control means of the printing press according to this invention;
Fig. 5 is a schematic view illustrating the relative position of the keyways in the printing press according to this invention;
Figs. 6A and 6B are schematic views illustrating the operation of the locking means of the printing press according to this invention; and
Figs. 7A and 7B are schematic views illustrating the positions of the locking means of the printing press according to this invention when the printing roller is in its rightmost, middle, and leftmost positions corresponding to Fig. 2.
A printing press of this invention is shown in Figs.
2-7A. As illustrated, the printing press is characterized by the carrier means for carrying a printing roller 21. The carrier means is driven by a sliding-block linkage 10 which includes a pair of sliding blocks 14 and a toggle mechanism for driving the sliding blocks 14 to effect a horizontally reciprocating motion in a slide slot B1 in a wall of a press base B. The toggle mechanism consists of a rotating wheel 11 drivable by a motor (not shown) links 12 and 13, and a rotating shaft 141 to which the sliding blocks 14 are connected rotatably.
The rotating shaft 141 is provided with a first pinion 15 secured to one end thereof for meshing with a first rack 16 fixed on the press base B below the first pinion 16 for maintaining stable sliding movement of the sliding blocks 14.
The shaft 22 of the printing roller 21 is connected rotatably to and between the sliding blocks 14.
The carrier means is equipped with a control means 30, as shown in Figs. 3 and 4. The control means 30 includes a hub 31 sleeved rigidly on the shaft 22 of the printing roller 21. The hub 31 includes a circular tube, and adjacent first and second rings 311 and 312 sleeved rigidly on the circular tube.
On the outer side of the first ring 311, there is a first sleeve 33 mounted rotatably on the inner end 315 of the circular tube by bearings 332, a second pinion 32A sleeved on and screwed to the first sleeve 33, a first locking member 35 mounted pivotally on a first projection 331 of the first sleeve 33 at one end thereof by a first pivot element 351, a first spring 333 interconnecting a lock bolt 352 screwed to the free end of the first locking member 35 and a lock bolt 334 screwed to the peripheral surface of the first sleeve 33, a first release member 37 screwed to the peripheral surface of the first sleeve 33 by lock bolts 371, and a second rack 39A positioned below and meshing with the second pinion 32A. The first ring 311 has a first keyway 313 formed in its peripheral surface.The first locking member 35 is formed on its radially inward surface with a first key 353 which is biased by the first spring 333 to insert into the first keyway 313 in the first ring 311.
Oppositely, on the outer side of the second ring 312, there is a second sleeve 34 mounted rotatably on the outer end 316 of the circular tube by bearings 342, a third pinion 32B sleeved on and screwed to the second sleeve 34, a second locking member 36 mounted pivotally on a second projection 341 of the second sleeve 34 at one end thereof by a second pivot element 361, a second spring 343 interconnecting a lock bolt 362 screwed to the free end of the second locking member 36 and a lock bolt 344 screwed to the peripheral surface of the second sleeve 34, a second release member 38 screwed to the peripheral surface of the second sleeve 34 by lock bolts 381, and a third rack 39B positioned above and meshing with the third pinion 32B. The second ring 312 has a second keyway 314 formed in its peripheral surface.The second locking member 36 is formed on its radially inward surface with a second key 363 which is biased by the second spring 343 to insert into the second keyway 314 in the second ring 312.
Referring to Fig. 5, in the hub 31, the first keyway 313 is diametrically opposite to the second keyway 314.
The first keyway 313 is defined by a straight side wall 313a and a V-shaped side wall 313b so that it is easy to move the first key 353 into the first keyway 313 along the V-shaped side wall 313b. Similarly, the second keyway 314 is defined by a straight side wall 314a and a V-shaped side wall 314b so that it is easy to move the second key 363 into the second keyway 314 along the V-shaped side wall 314b. Pads 315' and 316' are respectively provided on the bottom walls of the first and second keyways 313 and 314 so as to reduce the noise resulting from the engagement between the key and keyway.
Referring to Fig. 3, the first locking member 35 is formed in its axially inward surface with a first slot in which a first retractable element 354 is mounted.
The first retractable element 354 has an end mounted pivotally on the first locking member 35 by a pivot pin (not shown) which is inserted into the first slot through the radially inward surface of the first locking member 35. The free end 354a of the first retractable element 354 is biased to extend out of the first slot by a spring (not shown) which is installed in the first slot. The second release member 38 has an axially inward extending push arm 382 which can push the free end 354a of the first retractable element 35 into the first slot when the second release member 38 is rotated counterclockwise to register with the first retractable element 354, as illustrated in Fig. 6A. In addition, the second release member 38 has a tapered side portion 383 which can push the first retractable element 354 radially outward to disengage the first key 353 from the first keyway 313 when the second release member 38 is rotated clockwise to register with the first retractable element 354, as illustrated in Fig 6B.
Oppositely, the second locking member 36 is formed in its axially inward surface with a second slot in which a second retractable element 364 is mounted. The second retractable element 364 has an end mounted pivotally on the second locking member 36 by a pivot pin (not shown) which is inserted into the second slot through the radially inward surface of the second locking member 36. The free end 364a of the second retractable element 364 is biased to extend out of the second slot by a spring (not shown) which is installed in the second slot. The first release member 37 has an axially inward extending push arm 372 which can push the free end 364a of the second retractable element 364 into~ the second slot when the first release member 37 is rotated clockwise to register with the second retractable element 364.The first release member 37 has a tapered side portion 373 which can push the second retractable element 364 radially outward when the first release member 37 is rotated counterclockwise to register with the second retractable element 364.
Referring to Fig. 4, the push arms 372 and 382 of first and second release members 37 and 38 rotate on the same plane in such a manner that they are radially spaced from each other.
Referring to Figs. 2, 7A and 7B, in operation, when the shaft 22 of the printing roller 21 is in its rightmost position, the first locking member 35 is in its uppermost position in which the first key 353 engages with the first keyway 313, while the second locking member 36 is in its lowermost position in which the second key 363 disengages from the second keyway 314. When the first locking member 35 is in its uppermost position, the free end 354a of the first retractable element 354 is pushed by the second release member 38 into the first slot. When the second locking member 36 is in its lowermost position, the second retractable element 364 is moved radially outward by the first release member 37.
When the printing roller 22 is moved from its rightmost position to its middle position, the relative position between the second pinion 32A and the second rack 39A permits the second pinion 32A to rotate counterclockwise so that the first locking member 35 and hence the shaft 22 and the printing roller 21 rotate counterclockwise due to the engagement between the first key 353 and the first keyway 313, while the relative position between the third pinion 32B and the third rack 39B permits the third pinion 32B and hence the second locking member 36 to rotate c DCkwise.
When the shaft 22 is moved to its leftmost position, the first locking member 35 is in its lowermost position in which the second release member 38 moves the first locking member 35 radially outward to disengage the first key 353 from the first keyway 313, while the second locking member 35 is in its uppermost position in which the first release member 37 pushes the free end 364a of the second locking member 36 into the second slot so that the second key 363 is biased by the second spring 343 to engage with the second keyway 314. When the shaft 22 is moved back to its rightmost position, the second pinion 32A rotates clockwise, while the third pinion 32B rotates counterclockwise, so that the shaft 22 and the printing roller 21 still rotate counterclockwise due to the engagement between the second key 363 and the second keyway 314.
Consequently, the printing roller 21 always rotates counterclockwise.
With the straight side walls 313a and 314a and the Vshaped side walls 313b and 314b defining the first and second keyways 313 and 314, the change between the engagement and disengagement of the key and keyway may be effected accurately.
With this invention thus explained, it is apparent that numerous modifications and variations can be made without departing from the scope and spirit of this invention. It is therefore intended that this invention be limited only as indicated in the appended claims, without excluding obvious mechanical equivalents
and elements or arrangements functionalty analogous to
those therein specified.
Claims (2)
1. A printing press comprising:
(1) a sliding-block linkage including a sliding block means and a toggle mechanism for driving the sliding block means to effect a horizontally straight reciprocating motion;
(2) a press base; (3) a printing roller disposed above the press base and having a shaft connected to the sliding block means for synchronous horizontally straight reciprocating motion therewith; (4) a first pinion and rack means including a first pinion mounted rotatably on the sliding block means, and a first rack fixed horizontally on the press base for meshing with the first pinion when the sliding block means is moved horizontally; and (5) means for stably rotating the printing roller in a uniform direction whenever the printing roller is moved horizontally in any direction, the rotating means including: (a) a second pinion and rack means including a second pinion mounted rotatably on said shaft of said printing roller, and a second rack fixed horizontally on said press base below said second pinion for meshing with said second pinion when said shaft is moved horizontally; (b) a third pinion and rack means including a third pinion mounted rotatably on said shaft of said printing roller, and a third rack fixed horizontally on said press base above said third pinion for meshing with said third pinion when said shaft is moved horizontally; (c) a first locking means for automatically interlocking said second pinion and said shaft of said printing roller when said second pinion rotates in a predetermined direction; and (d) a second locking means for automatically interlocking said third pinion and said shaft of said printing roller when said third pinion rotates in the predetermined direction; chacaterized by: (1) said first locking means including: (a) a first ring sleeved rigidly on said shaft of said printing roller and having a first keyway formed in its peripheral surface; (b) a first sleeve mounted rotatably on said shaft of said printing roller near said first ring, said second pinion being connected securely to said first sleeve; (c) a first locking member mounted pivotally on said
first sleeve and including a first key projecting radially inward therefrom, and a first spring biasing said first key to engage with said first keyway for
interlocking said second pinion and said shaft of said printing roller; and
(d) a first release member fixed on said first sleeve and extending toward said second locking means for releasing said third pinion from said shaft of said printing roller when said first key engages with said first keyway; and
(2) said second locking means including:
(a) a second ring sleeved rigidly on said shaft of said printing roller near said first ring and having a second keyway formed in its peripheral surface;
(b) a second sleeve mounted rotatably on said shaft of said printing roller near said second ring, said third pinion being connected securely to said second sleeve;;
(c) a second locking member mounted pivotally on said second sleeve and including a second key radially inward projecting therefrom, and a second spring biasing said second key to engage with said second keyway for interlocking said third pinion and said shaft of said printing roller, said second locking member being pushed by said first release member to disengage said second key from said second keyway when said first key engages with said first keyway; and
(d) a second release member fixed on said second sleeve and extending toward said first locking member, said second release member pushing said first locking member to disengage said second key from said second keyway when said second key engages with said second keyway; whereby, said second and third pinions are locked alternately on said shaft of said printing roller for driving said printing roller to always rotate in a uniform direction.
2. A printing press substantially as described hereinbefore with reference to figures 2-7B of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8807019A GB2215664B (en) | 1988-03-24 | 1988-03-24 | A printing press having a printing roller which always rotates in a uniform direction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8807019A GB2215664B (en) | 1988-03-24 | 1988-03-24 | A printing press having a printing roller which always rotates in a uniform direction |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8807019D0 GB8807019D0 (en) | 1988-04-27 |
| GB2215664A true GB2215664A (en) | 1989-09-27 |
| GB2215664B GB2215664B (en) | 1991-08-21 |
Family
ID=10634032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8807019A Expired - Fee Related GB2215664B (en) | 1988-03-24 | 1988-03-24 | A printing press having a printing roller which always rotates in a uniform direction |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2215664B (en) |
-
1988
- 1988-03-24 GB GB8807019A patent/GB2215664B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2215664B (en) | 1991-08-21 |
| GB8807019D0 (en) | 1988-04-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930324 |