Claims
- 1. A printing switching apparatus for a sheet-fed rotary press with a reversing mechanism, comprising:
- a fixed gear fixed to a shaft of a first cylinder;
- a rotary gear coaxial with said fixed gear and coupled to be driven with a second adjacent cylinder along a paper convey direction, said rotary gear being phase-adjustable with respect to said fixed gear in a circumferential direction;
- fixing means for fixing said rotary gear to one of said fixed gear and said shaft of said first cylinder to perform rotational transmission such that phase switching of said rotary gear between single-sided printing and perfecting printing is performed when said fixing means is released, and said rotary gear is not fixed to one of said fixed gear and said shaft of said first cylinder; and
- detecting means for detecting that said rotary gear is positioned in a phase of single-sided printing when said rotary gear is fixed to one of said fixed gear and said shaft of said first cylinder by said fixing means.
- 2. An apparatus according to claim 1, further comprising a reference pin provided to one of said rotary gear and said fixed gear including said shaft of said first cylinder and a reference hole formed in the other of said rotary gear and said fixed gear including said shaft of said first cylinder and engaged with said reference pin when said rotary gear is positioned in the phase of single-sided printing, and wherein said detecting means detects that said reference pin is engaged with said reference hole on the basis of a displacement of said reference pin.
- 3. An apparatus according to claim 2, further comprising releasing means for releasing engagement between said reference pin and said reference hole when single-sided printing is to be switched to perfecting printing.
- 4. An apparatus according to claim 3, further comprising biasing means for biasing said reference pin in a direction to be engaged with said reference hole, and wherein said fixed gear has an annular stepped small-diameter portion on an outer circumferential surface, said rotary gear has an annular shape and is rotatably held on the outer circumferential surface of said stepped small-diameter portion of said fixed gear, a guide hole for movably holding said reference pin is formed in a side surface of one of said fixed gear and said rotary gear, said reference hole is formed in a side surface of the other of said fixed gear and said rotary gear in correspondence with said guide hole, and said releasing means removes said reference pin from said reference hole against a biasing force of said biasing means to release engagement between said reference hole and said reference pin.
- 5. An apparatus according to claim 3, wherein said releasing means releases engagement between said reference pin and said reference hole and releases a fixed state of said rotary gear by said fixing means in an interlocked manner.
- 6. An apparatus according to claim 4, wherein said releasing means is constituted by driving means, a press member driven by said driving means, a first releasing lever pressed by said press member to remove said reference pin from said reference hole against the biasing force in a direction of said reference hole, and a second releasing lever pressed by said press member to release a fixed state of said rotary gear by said fixing means.
- 7. An apparatus according to claim 2, wherein said detecting means is constituted by a switch including a mechanical proximity switch for detecting a rear end portion of said reference pin whose distal end portion is engaged with said reference hole by one of mechanical, optical, magnetic, and capacitive methods, said switch outputting a signal representing that said reference pin is engaged with said reference hole when said rear end portion of said reference pin is not detected.
- 8. An apparatus according to claim 1, further comprising control means for outputting a drive signal when three conditions as setting of single-sided printing, fixing of said rotary gear by said fixing gear, and a detection output from said detecting means are satisfied, and notifying means, driven in accordance with the drive signal from said control means, for notifying that said rotary gear is not positioned in the phase of single-sided printing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-064186 U |
Nov 1993 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 08/334,213 filed Nov. 4, 1994, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (9)
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0216045 |
Jul 1986 |
EPX |
0243700 |
Mar 1987 |
EPX |
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Mar 1993 |
EPX |
3315445 |
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DEX |
3526253 |
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DEX |
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JPX |
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GBX |
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Continuations (1)
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Number |
Date |
Country |
Parent |
334213 |
Nov 1994 |
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