1. A printing apparatus comprising:
a printing unit configured to form an image on a printing medium;
a scanning unit pivotally coupled to the printing unit;
a cover unit pivotally coupled to the scanning unit, the cover unit having a pressing protrusion;
a first member rotatably mounted to the scanning unit, the first member configured to latch the scanning unit to the printing unit when the cover unit is in an open state with respect to the scanning unit; and
a second member mounted to the scanning unit and configured to move linearly in a down direction with respect to the first member to rotate the first member to unlatch the scanning unit from the printing unit when pressed by the pressing protrusion of the cover unit moving from the open state to a closed state with respect to the scanning unit.
2. The printing apparatus of claim 1, wherein, the second member is configured to move linearly in an up direction with respect to the first member to disengage from the first member when the cover unit is moved from the closed state to the open state, and
the first member is biased to automatically rotate to a latched position when disengaged from the second member.
3. The printing apparatus of claim 1, wherein,
the second member is configured to move linearly in an up direction to disengage from the first member when the cover unit is moved from the closed state to the open state, and
the first member includes a hook part and a spring part to automatically rotate the hook part to a latched position when disengaged from the second member.
4. The printing apparatus of claim 1, further comprising a third member rotatably mounted to the scanning unit to latch the scanning unit to the cover unit when the scanning unit is in an open state with respect to the printing unit.
5. The printing apparatus of claim 4, wherein,
the pressing protrusion includes a hook part, and
the third member includes a hook part to latch the hook part of the pressing protrusion to latch the scanning unit to the cover unit.
6. The printing apparatus of claim 5, wherein the hook part of the third member latches the hook part of the pressing protrusion to latch the scanning unit to the cover unit based on a gravitational force exerted on the third member when the scanning unit is moved from a closed state to an open state with respect to the printing unit.
7. The printing apparatus of claim 1, wherein the first member includes:
a force transmitting portion to receive a force from a lower end of the second member to cause rotation of the first member, and
a latching portion latched to the printing unit depending on a rotational angle of the first member.
8. An image forming apparatus, comprising:
an image forming unit which forms an image on a printing medium;
an image reading unit, pivotally coupled to the image forming unit, and including a first hook member rotatably mounted to the image reading unit, and a lever member mounted to the image reading unit and linearly movable in an up direction and a down direction with respect to the first hook member; and
a document feeding unit, pivotally coupled to the image reading unit, and including a pressing protrusion operable to press the lever member in the down direction to unlatch the image forming unit and the image reading unit from each other, and in the up direction to thereby latch the image forming unit and the image reading unit to each other.
9. (canceled)
10. The image forming apparatus of claim 8, the image reading unit including a second hook member rotatably mounted to latch the image reading unit and the document feeding unit to each other.
11. The image forming apparatus of claim 10, wherein,
the pressing protrusion includes a hook part, and
the second hook member includes a hook part to latch the hook part of the pressing protrusion to latch the image reading unit and the document feeding unit to each other.
12. The image forming apparatus of claim 11, wherein the hook part of the second hook member latches the hook part of the pressing protrusion to latch the image reading unit and the document feeding unit to each other based on a gravitational force exerted on the second hook member when the image reading unit is moved from a closed state to an open state with respect to the image forming unit.
13. The image forming apparatus of claim 8, wherein the first hook member includes:
a force transmitting portion to receive a force from a lower end of the lever member to cause rotation of the first hook member; and
a latching portion latched to the image forming unit depending on a rotational angle of the first hook member.
14. An image forming apparatus, comprising:
an image forming unit which forms an image on a printing medium;
an image reading unit pivotally coupled to the image forming unit;
a document feeding unit, pivotally coupled to the image reading unit, the document feeding unit having a pressing protrusion to move a sliding member by pressing the sliding member; and
a locking device including:
the sliding member mounted to the image reading unit to move up and down linearly relative to the image reading unit; and
a first latching member rotatably mounted to the image reading unit, the first latching member configured to latch the image forming unit,
wherein the document feeding unit rotating from an open position to a closed position with respect to the image reading unit causes the pressing protrusion to press the sliding member to rotate the first latching member so that the first latching member is unlatched from the image forming unit and the image reading unit is separable from the image forming unit.
15. The image forming apparatus of claim 14, the locking device including a second latching member rotatably mounted to the image reading unit to latch the image reading unit to the document feeding unit when the image reading unit is separated from the image forming unit.
16. The image forming apparatus of claim 15, wherein,
the pressing protrusion includes a hook part, and
the second latching member includes a hook part to latch the hook part of the pressing protrusion to latch the image reading unit to the document feeding unit.
17. The image forming apparatus of claim 16, wherein the hook part of the second latching member latches the hook part of the pressing protrusion to latch the image reading unit to the document feeding unit based on a gravitational force exerted on the second latching member when the image reading unit is separated from the image forming unit.
18. The image forming apparatus of claim 14, wherein the first latching member includes:
a force transmitting portion to receive a force from a lower end of the sliding member to cause rotation of the first latching member, and
a latching portion latched to the image forming unit depending on a rotational angle of the first latching member.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sparse switch matrix, comprising:
a plurality of ports; and
a plurality of interconnected universal switches coupled to the plurality of ports, wherein each universal switch is independently switchable, and wherein the plurality of interconnected universal switches are configurable to implement connections between any first subset of ports of the plurality of ports and any second subset of the remaining ports of the plurality of ports.
2. The sparse switch matrix of claim 1, wherein one or more of the plurality of ports are common ports.
3. The sparse switch matrix of claim 2, wherein each signal path from a respective one of the common ports to each port of a selected subset of the plurality of ports has approximately equivalent electrical length and impedance.
4. The sparse switch matrix of claim 1, wherein the universal switches are switchable to implement a plurality of dimensionally different switch matrices, wherein a first subset of the plurality of ports is specified as row ports and a second subset of the remaining ports of the plurality of ports is specified as column ports.
5. The sparse switch matrix of claim 4, wherein the plurality of interconnected universal switches are switchable to connect ports row-to-row without connecting to a column, column-to-column without connecting to a row, or both row-to-row and column-to-column.
6. The sparse switch matrix of claim 1, wherein each universal switch comprises:
a first terminal, a second terminal, and a third terminal; and
a plurality of interconnected switches, coupled to the terminals, wherein each switch is independently switchable;
wherein the plurality of interconnected switches are configurable to implement:
the first terminal connected only to the second terminal;
the first terminal connected only to the third terminal;
the second terminal connected only to the third terminal; or
the first terminal connected to the second terminal and the third terminal.
7. The sparse switch matrix of claim 1, wherein the plurality of interconnected universal switches are independently switchable to provide a radio frequency signal route from any port of the plurality of ports to any other port of the plurality of ports,
8. The sparse switch matrix of claim 7, wherein the universal switch comprises two interconnected single pole double throw switches.
9. The sparse switch matrix of claim 8, wherein the radio frequency signal has a frequency greater than approximately 500 mega-hertz.
10. The sparse switch matrix of claim 1, further comprising one or more disconnect switches, wherein each disconnect switch is connected between a port and a terminal of a universal switch.
11. The sparse switch matrix of claim 10, further comprising a controller operable to set the internal connection state of each universal switch and each disconnect switch such that the first and second subsets of the plurality of ports are connected, wherein the controller is coupled to the universal switches and the disconnect switches.
12. The sparse switch matrix of claim 1, wherein the plurality of universal switches are independently switchable to subdivide the sparse matrix into independent portions of the sparse matrix.
13. The sparse switch matrix of claim 12, wherein each independent portion of the sparse matrix is operable to carry an independent signal.
14. The sparse switch matrix of claim 1, wherein at least a subset of the plurality of ports are terminated.
15. A sparse switch matrix, comprising:
a first sparse matrix module, wherein the module comprises:
a first universal switch, a second universal switch, and a third universal switch, wherein each universal switch has a first terminal, a second terminal, and a third terminal, and wherein the third terminal of the first universal switch is connected to the first terminal of the third universal switch and the third terminal of the second universal switch is connected to the second terminal of the third universal switch;
a first port connected to the first terminal of the first universal switch;
a second port connected to the second terminal of the first universal switch;
a third port connected to the first terminal of the second universal switch; and
a fourth port connected to the second terminal of the second universal switch; and
a first common port connected to the third terminal of the third universal switch;
wherein the universal switches are switchable to provide a signal path from any first subset of the ports to any second subset of the ports.
16. The sparse switch matrix of claim 15, further comprising one or more disconnect switches, wherein each disconnect switch is connected between a port and a corresponding terminal of a universal switch.
17. The sparse switch matrix of claim 15, wherein each signal path from the first common port to any other port has approximately equivalent electrical length and impedance.
18. The sparse switch matrix of claim 15, further comprising:
one or more additional sparse matrix modules;
one or more common ports; and
a set of universal switches interconnecting the sparse matrix modules and the one or more common ports.
19. The sparse switch matrix of claim 18, wherein the set of universal switches is switchable to connect a common port to one or more of the sparse matrix modules.
20. The sparse switch matrix of claim 19, wherein the set of universal switches are interconnected to allow the one or more common ports to be disconnected from the sparse matrix modules.
21. The sparse switch matrix of claim 18, further comprising one or more disconnect switches, wherein each disconnect switch is connected between a port and a corresponding terminal of a universal switch.
22. The sparse switch matrix of claim 18, wherein the signal path lengths from a common port to a selected set of other ports are approximately equivalent.