WASHINGTON – The Federal Reserve appears on track to slow its bond purchases by the end of this year if the economy continues to improve, but it remains divided over the exact timing of the move.

That’s the message from the minutes of the Fed’s July 30-31 meeting released Wednesday.

A few policymakers said they wanted to assess more economic data before deciding when to scale back the central bank’s $85 billion a month in Treasury and mortgage bond purchases. These policymakers “emphasized the importance of being patient,” the minutes said.

Others said it “might soon be time” to slow the purchases, which have helped keep long-term borrowing rates near record lows.

“There’s more debating than deciding,” said Michael Hanson, senior economist at Bank of America Merrill Lynch. “We didn’t get a strong indication that the committee broadly is prepared to taper in September.”

Nor did the minutes give any indication of how fast the Fed would scale back its purchases once it begins – or whether it would cut back equally on Treasury and mortgage bond buying.

Since the July policy meeting, a few Fed officials have suggested that the central bank could slow the bond buying as soon as September. By then, updated reports on U.S. employment and economic growth will have been issued.

The Fed is considered most likely to slow its bond buying after its September or December policy meeting because after each one, Chairman Ben Bernanke will hold a news conference and could explain such a major step.

The Fed holds eight policy meetings a year; four include news conferences by the chairman. Besides September and December, the Fed will also meet in October before the year ends.

The minutes suggested that future Fed statements may provide no advance warning of any policy shift before it happens. Several members suggested that providing advance notice might confuse stock and bond investors.

In June, Bernanke signaled that the Fed would scale back its purchases later this year as long as the economy continued to improve. And he said the purchases would likely end by the middle of 2014, when the Fed expects the unemployment rate to be around 7 percent. It’s now 7.4 percent.

Since then, investors have focused on when the Fed might begin to slow its purchases. Stocks have fallen on speculation that the Fed is moving closer to pulling back on the bond buying.

The yield on the 10-year Treasury note has surged about three-quarters of a percentage point, lifting rates on mortgages and other loans. The average rate on a 30-year mortgage has risen about a full point since May to 4.4 percent.

The minutes released Wednesday show that Fed policymakers agreed that they won’t raise the short-term interest rate they control from a record low near zero at least until the unemployment rate falls to 6.5 percent. Several members even said they were willing to lower that threshold.

The minutes showed that some policymakers were less confident than they were at their June meeting that economic growth will pick up later this year. They cited higher mortgage rates, slower growth overseas and the potential for continuing cuts in government spending as the main reasons.

But several said they thought the housing market would continue to recover despite higher rates. If so, that would provide an important boost to the economy.

Those Fed officials, who aren’t identified, said banks have become more willing to provide mortgage loans, consumer confidence has increased and mortgage rates are still low by historical standards.